Essex on Wikipedia.

Abbess Roding, St. Edmund. From an old postcard (franked 1911) in Reg Dosell's Collection. Link.
Aldham, St. Margaret and St. Catherine. From an old postcard in Reg Dosell's Collection. Link.
Alphamstone, St. Barnabas. Three interiors - 1, 2, 3, a window, and the font. All © Chris Stafford (2013). Link. Grade I listed.
Alresford, the ruins of St. Peter, burnt down in a fire in 1971. The churchyard is still in use. The church was replaced  - St. Andrew and St. Peter. TM 068 213. Both © Les Needham.
Arkesden, St. Mary the Virgin. Older maps label it as St. Margaret. Another view. TL 4822 3460. Both © Barry Mace. A window, interior view, a selection of the many fine monuments - 1, 2, 3, and the font, all © Chris Stafford (2013). Link. Grade II* listed. A former Wesleyan Methodist Chapel stands a little way west of the village, at Hampits, at TL 4783 3465. Converted into a house, it can be seen on a Streeview from 2019.
Ashen, St. Augustine of Canterbury. © Chris Stafford (2013). Link. Grade I listed.

Barking, St. Margaret. A rather heavily processed old postcard in Steve Bulman's Collection. Link.
Barling Magna, All Saints. TQ 9320 8971. © Julieanne Savage.
Basildon.
Belchamp Otten, St. Ethelbert and All Saints. Three additional views - 1, 2, 3. TL 8033 4176. All © Roger Heap (2015). The porch doorway, two interior views - 1, 2, the altar, and the font, all © Chris Stafford (2013). Link. Grade I listed. An Independent Chapel (later Congregational) is labelled on old O.S. maps at TL 8009 4168. It pre-dates the earliest map available to me (1876), and seems to have been closed before 1957. The site of the chapel and adjoining burial ground, which has been redeveloped for housing, can be seen in this 2009 Streetview. I've been unable to find a photo, or any substantial information, about this chapel.
Belchamp St. Paul, St. Andrew, which stands about a mile N.N.E. of the village, at TL 7983 4346. Three interior views - 1, 2, 3, the altar, one of the many fine bench-ends, and the font. All © Chris Stafford (2013). Link. Grade I listed.
Belchamp Walter, St. Mary the Virgin. Three additional views - 1, 2, 3. TL 8273 4069. All © Roger Heap (2015). The church has some good wall paintings; the interior, a window detail, and the font, all © Chris Stafford (2013). Link. Grade I listed.
Benfleet, Holy Family Church (R.C.). © Mark Summers. Link.
Berden, St. Nicholas. Another view, a fine window, two interior views - 1, 2, and the font. TL 4677 2963. All © Chris Stafford (2013). Link. Grade I listed. The 25" O.S. map of 1897 marks a Wesleyan Methodist Chapel at TL 4694 2985. The chapel pre-dates a map of 1876-7, and the latest map to show it which I can find is dated 1960. A map of 1978 shows a Hall on the same site, and it can be seen here on a Streetview of 2009. It seems to have roughly the same footprint, so perhaps all or part of the chapel survives, in what is now the village hall.
Birdbrook, St. Augustine. Another view. TL 7067 4115. Both Karel Kuča (2019). More photos are available here and here. Grade II* listed.
Blackmore, the Priory Church of St. Lawrence. TL 6031 0161. © Alan Wilson. Two more views - 1, 2, the porch, and two views of the interior - 1, 2, all © Karel Kuča (2007). Link. Grade I listed. The Baptist Church, on The Green, as seen by Streetview in 2021. TL 6049 0185. Link.
Bocking, St. Mary the Virgin. As can be seen from the church website, the tower finials have been reduced or removed since this postcard was published. From an old postcard, Geoff Watt's Collection. Link.
Borley, dedication unknown or lost. © Mark Turbott. Another view, and the tower and porch, both © Chris Stafford (2013). Grade I listed.
Bowers Gifford, St. Margaret of Antioch. TQ 755 872. © Mark Summers. Two additional views 1, 2, both © William Metcalfe. This church has also appeared in the "Unknown" section, original entry as follows - "John James has an old family photo, and the people in the photo all lived in Monmouthshire, in the Abertillery/Llanhilleth area. Can you identify the church?" My appreciation to Greg Mishevski and Brian Curtis for the identification, and for not being misled by the Welsh clue! Link. The Church at Gun Hill. Link. © Mark Summers.
Boxted, St. Peter. Two more views - 1, 2, the porch, interior, altar, the stone pulpit and the font. TL 9983 3323. All © Karel Kuča (2007). Link. Grade I listed.
Bradwell-juxta-Coggeshall, Holy Trinity. Two further views - 1, 2, and the wooden porch. All © Roger Heap (2012). Link. Grade I listed - link.
Bradwell-on-Sea, St. Peter-on-the-Wall. This is a remarkable survival (the nave of a once-larger church), dating from the 7th century, and is in regular use. Interior view. Both © Iris Maeers. Link. Grade I listed. St Thomas the Apostle, © Tim Flitcroft (2014). Link. Grade II* listed.
Brentwood.
Broxted, St. Mary the Virgin. Three interior views - 1, 2, 3, a side chapel, the fine flat-carved pulpit, and a modern font. Two windows commemorate the travails of the hostage John McCarthy - a mostly grey one "Hostage", and a mostly blue one "Freedom". TL 5784 2738. All © Chris Stafford (2012). Two additional views - 1, 2, and another interior, all © Karel Kuča (2019). Link. Grade II* listed.
Bulmer, St. Andrew. The porch, two of the interior - 1, 2, sedilia, and the splendid font (dated to ca. 1500 in the appended listing). TL 8434 4011. All © Chris Stafford (2013). Link. Grade I listed. Older O.S. maps mark a Congregational Chapel on The Street, at TL 8418 4025. Seen by Streetview in 2018, it's dated here (quoting from an old directory) to 1873.
Bulphan, St. Mary the Virgin. Interior view. TQ 636 858. Both © Dave Westrap. Two old postcard views, exterior (franked 1907) and interior (of approximately the same date), both from Dave Westrap's Collection. Link1. Link2. Zion Hall Interdenominational Chapel. TQ 639 859. © Dave Westrap.
Burnham-on-Crouch, St. Mary the Virgin. © Bill McKenzie. Jan Bradley had sent me some scans of old stereoviews. This one was identified by Phil Draper. Phil was able to date one of the others as being of pre-1873 vintage, so this one is probably of a similar date. Link. Grade II* listed. Burnham Baptist Church (1904) on High Street. TQ 950 957. Another view, and the foundation stone. All © Steve Taylor. Link.
Buttsbury (near Ingatestone), St. Mary. Another view. Interior view. TQ 663 986. All © William Metcalfe. Link.

Canewdon, St. Nicholas. Two additional views - 1, 2. All © Roger Heap (2015). Link. Grade II* listed.
Canvey Island.
Castle Hedingham, St. Nicholas. The 6" O.S. map of 1897 says St. Nicholas's Church (Vicarage) on Site of St. James's Church. A Norman door, two interior views - 1, 2, the hammer-beam roof, the very fine piscina and sedilia (with much C19/20 restoration, says the grade I listing), stoup, pulpit and the font. TL 7846 3560. All © Chris Stafford (2013). Link. The War Memorial in the churchyard is separately listed as grade II. Old maps show a Congregational Chapel on Queen Street, at TL 7840 3539. It was seen by Streetview in 2009. The sign had gone by 2016, so had presumably closed by then. Grade II* listed. There was at one time a Priory (Benedictine Nunnery) to the west of the village at TL 77790 35560 - grid ref. from this source, which says that only a small fragment of masonry survives. If the grid ref. is accurate, the fragment should be somewhere along the left-most hedge-line - seen in Streetview from 2021. 
Chelmsford.
Chickney, St. Mary the Virgin, now in the care of the Churches Conservation Trust. Its grade I listing says it is late Saxon. Another view, the interior, and the font. TL 5743 2805. All © Chris Stafford (2012). Link.
Chipping Ongar, St. Martin. Another view. Both © Bill McKenzie.
Chrishall, Holy Trinity. © Marion Hall. Link. Grade I listed - link.
Churchend, on Foulness Island. Rebuilt in 1848. Much of the island is under the Ministry of Defence, so access is limited. TR 0093. © Julieanne Savage.
Clacton-on-Sea, St. John the Baptist at Great Clacton. From an old postcard in Steve Bulman's Collection (franked, 1905). Link.
Clavering, St. Mary and St. Clement. TL 4708 3181. © Marion Hall. Another view, the porch, chancel, a minstrel, several memorials, the pulpit, and the font, all © Chris Stafford (2013). Link. Grade I listed. Clavering Christian Centre on Stortford Road, as seen by Streetview in 2009. Older O.S. maps label it as Congregational. Although not itself listed, the war memorial in the grounds is, as grade II. TL 4733 3174. The former Methodist Chapel, originally Primitive Methodist, at Hill Green. It's dated here to 1877-8, where it also says that there was a preceding chapel of 1844 - though whether it was on the same site isn't clear. It was seen (distantly) by Streetview in 2021. TL 4815 3234.
Coggeshall, St. Peter ad Vincula on Church Green. Another view, two interiors - 1, 2, a side chapel, and the font. The church has some good wood carvings. TL 8535 2302. Link. Grade I listed. Christ Church on Stoneham Street. TL 8499 2274. Link. Wesley Hall, also on Stoneham Street, appears to be the hall for Christ Church, but was presumably a Wesleyan Methodist Church at some point. Circa TL 84965 22670. Old Chapel on Church Street was Baptist (as shown on map of 1875), and had been opened in 1855. It was preceded by an earlier chapel of 1829, also on Church Street, so perhaps on the same site. Prior to this, the congregation, formed at least as early as 1745, met in private houses. TL 8514 2271. The Catholic Church of St. Bernard of Clairvaux on Stoneham Street. TL 84965 22768. Link. The former Friends' Meeting House (1878) on Stoneham Street is now the library. It stands on the site of an earlier Friends' Meeting House, which, according to the plaque, was purchased in 1673, and so presumably a pre-existing building. TL 84946 22729. An unusual entry for this website is the Woolpack Inn on Church Street. The plaque provides the explanation. TL 85312 22944. All © Steve Bulman (2016).
Colchester.
Coopersale, St. Alban. From an old postcard in Steve Bulman's Collection. Link.
Cornish Hall End, St. John the Evangelist (1841, C). © Chris Stafford (2013). Link.
Corringham, St. Mary the Virgin. © Mark Summers. Link.

Debden, St. Mary the  Virgin and All Saints. Another view, and two of the interior - 1, 2. TL 5510 3322. All © Karel Kuča (2019). Link. Grade I listed. Debden Pentecostal Church on Thaxted Road, as seen by Streetview in 2014. TL 5597 3311. Link. The history page dates it to 1996, replacing an earlier structure on the same site, of 1950. There's a photo on the history page. Old O.S. maps show a Congregational Chapel on High Street, at TL 5573 3340. It pre-dates a map of 1897. A photo of it can be seen here - but I've been unable to see it on Streetview - though foliage interferes. It may have gone.
Dedham, St. Mary the Virgin. © Steve Bulman. Another view of St. Mary, © Judith Anderson. Interior view, © John Balaam (2008). The former U.R.C., now a craft centre (thanks to Les Needham for advising the former denomination). © Steve Bulman.

Duddenhoe End, The Hamlet Church. It was originally a tithe barn, but consecrated in 1859. Another unusual feature (which obviously wasn't an issue when it was built) is its orientation, running roughly N-S rather than the traditional E-W. TL 4615 3722. Another view, two of the interior - 1, 2, and the font. All © Chris Stafford (2013). Link.

East Horndon, All Saints, is now in the care of the Churches Conservation Trust, but still holds occasional services. The graveyard is still in use. A 2008 Streetview provides another viewpoint (later views are even more hampered by vegetation). TQ 6355 8952. Photo © Brian Thompson. Additional information kindly supplied by Linda Golding. News item regarding disgraceful events here in 2020. The grade II* listing has more photos.
Eastwood, St. David. TQ 8289. © Julieanne Savage. Link.
Epping, St. John the Baptist (interior). From an old postcard in Steve Bulman's Collection. Link. Grade II* listed.

Fairstead, St. Mary the Virgin and St. Peter. From an old postcard in Geoff Watt's Collection. Link.
Farnham, St. Mary the Virgin. It's grade II listing dates it to 1859, built on the foundations of its predecessor. Three further views - 1, 2, 3. TL 4814 2480. All © Chris Stafford (2013). Link.
Fobbing, St. Michael. © Mark Summers. The following are all © Jack Nicholson - another view, and another, the porch, Link.
Foxearth, St. Peter and St. Paul (C). Another view. TL 836 448. Both © Janice Tostevin. Link.
Frinton. Thanks to Dave Westrap for identifying this church as St. Mary the Virgin, and for providing the links at the end of the entry. From an old postcard, Geoff Watt's Collection. Previously in the "Unknown" section, John Bowdler's photo taken some years ago was identified by Janet Gimber and Simon Davies. Link1. Link2. Link3.
Fryerning, St. Mary the Virgin. © Alan Wilson. Link. Mill Green Gospel Hall, photographed in 1993. © Alan Taylor.

Gestingthorpe, St. Mary the Virgin. Another view, two of the interior - 1, 2, the double hammer-beam roof, sedilia, and a window. TL 8121 3856. All © Chris Stafford (2013). Link. Grade I listed. Two headstones in the churchyard are listed separately - they can be found here.
Grays, Bethel Full Gospel Church at South Stifford. © Alan Taylor.
Great Bardfield, St. Mary the Virgin. © Chris Stafford (2013). Link. Grade I listed.
Great Dunmow, St. Mary the Virgin. TL 630 220. Link1. Link2. Grade I listed. Our Lady of St. Anne Line (R.C.). TL 630 230. Link. U.R.C. TL 629 217. All © Les Needham (2013).
Great Easton, St. John and St. Giles. TL 608 255. © Les Needham (2013). Link. Grade II* listed.
Great Hallingbury, dedicated to St. Giles. TL 512 196. © Robert Mather. An old postcard view, from Reg Dosell's Collection.
Great Sampford, St. Michael the Archangel. Another view, three interior views - 1, 2, 3, animal column capitals - 1, 2, and the font. Some wall paintings survive. TL 6424 3535. All © Chris Stafford (2013). Link. Grade I listed. The Baptist Church is on High Street, and was seen by Streetview in 2021. TL 6429 3542. Link. The About Us page dates the church to 1875, successor to an earlier (un-located) chapel of 1802.
Great Totham, St. Peter, as seen by Streetview in 2009. TL 8620 1102. Link1. Link2. Grade II* listed. A number of monuments in the churchyard are listed separately - they can be seen here. Barn Church (Evangelical). Another view and the interior. TL 8529 1153. All © Karel Kuča (2007). Link, and history page. Grade II listed. Willie Almshouses Chapel of 1855, seen by Streetview in 2009. TL 8571 1144. Grade II listed.
Great Wakering, St. Nicholas. TQ 9496 8755. © Julieanne Savage.
Great Warley - see Baildon, West Yorkshire. Greensted, St. Andrew. Dating from 1060, it's the only surviving Saxon church, and supposedly the oldest wooden building anywhere. © Bill McKenzie. Another view. From an old postcard (franked 1906), Bulman Collection.
Great Yeldham, St. Andrew. Another view, and two of the interior - 1, 2. TL 7578 3866. All © Chris Stafford (2013). Link. Grade I listed. Hope Strict Baptist Chapel stands just off the main road to the south at TL 7615 3789. A photo can be seen here, wherein it's dated to 1875.

Hadleigh, St. James the Less. From an old postcard, Geoff Watt's Collection. Link.
Hadstock, St. Botolph. From an old postcard in Reg Dosell's Collection.
Hatfield Broad Oak, St. Mary the Virgin. Another view. Both from old postcards in Reg Dosell's Collection. Link.
Henham, St. Mary the Virgin. Another view, four interior views - 1, 2, 3, 4, an angel capital, an unusual triangular monument, and the font. Some fragments of wall-painting survive. TL 5444 2859. All © Chris Stafford (2013). Link. Grade I listed. Older maps show that the village used to have a Congregational Chapel, at TL 5457 2849. Baptism records for 1806-1930 are referenced here. Another source, which includes a photo of the chapel, says it was demolished in the 1960's. Its site was seen by Streetview in 2014. The 1" O.S. map of 1956 shows a place of worship south of the village on Mill Road at TL 5438 2800. It didn't exist in 1920, and I haven't been able to discover anything about it. A house now stands on the site, seen by Streetview in 2014.
High Ongar, St. Mary. © Alan Wilson.
Horndon-on-the-Hill, St. Peter and St. Paul. © Brian Thompson. Two views © Roger Heap, 1, 2. Link.
Hutton, All Saints. © Bill McKenzie. Another view, © Karel Kuča (2007).

Laindon, St. Nicholas. © Brian Thompson. An old postcard view, from Reg Dosell's Collection.
Lamarsh, Holy Innocents. TL 8897 3605. From an old postcard in Reg Dosell's Collection, which was faded, and had to be heavily processed to improve the image quality. A modern view, the porch, two views of the interior - 1, 2, a window detail, and the font, all © Chris Stafford (2013). Link. Grade I listed. Several older O.S. maps show a Baptist Chapel at TL 8909 3569. It can be seen in a Streetview from 2009. Is this the chapel or a newer building on its site?
Langdon Hills, Basildon.
Langford, St. Giles. Another view. Both © Steve Taylor. Link.
Langley, St. John the Evangelist (C) on The Causeway. Two additional views - 1, 2. There is a Norman door with simple roll-moulding. Interior view, through a window. All © Chris Stafford (2013). Grade II* listed.
Lawford, St. Mary. The porch, and an interior view. All © John Bowdler. Link.
Leigh-on-Sea.
Lindsell, St. Mary the Virgin. Two more views - 1, 2, the former anchorite's cell, and three of the interior - 1, 2, 3. TL 6436 2711. All © Chris Stafford (2013). Link1. Link2. Grade II* listed.
Liston, no dedication or dedication lost (C). Another view, and the porch. All © Chris Stafford (2013). Link1, which suggests the dedication may have been St. Katherine. Link2. Link3.
Little Bardfield, St. Katharine. Two more views - 1, 2, two of the the interior - 1, 2, the chancel, and the font. TL 6555 3074. All © Chris Stafford (2013). Link. Grade I listed. A monument is separately listed as grade II.
Little Hallingbury, St. Mary. Another view. TL 5032 1747. Both © Karel Kuča (2019). Link. Grade II* listed.
Little Totham, All Saints. Two more views - 1, 2, Norman doorway, the interior, a fine monument, and the font. TL 8840 1032. All © Karel Kuča (2007). Link. Grade I listed.
Little Wakering, All Saints. TQ 9388. © Julieanne Savage.
Little Yeldham, St. John the Baptist. Two interior views - 1, 2. TL 7792 3956. All © Chris Stafford (2013). Link. Grade II listed.

Magdalen Laver, St. Mary Magdalen. Two additional views - 1, 2, and two interiors - 1, 2. TL 5131 0828. All © Karel Kuča (2007). Link. Grade II* listed.
Maldon.
Manuden, St. Mary the Virgin. TL 4910 2666. © Nadine Pedley. Two additional views - 1, 2, four views of the interior - 1, 2, 3, 4, and the font. All © Chris Stafford (2013). Link. Grade II* listed.
Margaretting, St. Margaret. Two more views - 1, 2, the porch and its door. All © Karel Kuča (2007). Link. Grade II* listed.
Marks Tey, St. Andrew. Another view, the porch, and the interior. TL 9112 2388. All © Karel Kuča (2007). Link. Grade I listed. The Methodist Church stands on London Road at TL 9211 2381. Seen by Streetview in 2009, it post-dates a map of 1949.
Middleton, All Saints. Previously in the "Unknown" section, this postcard (franked 1905), is from Judy Flynn's Collection. Brian Curtis, Simon Davies, Janet Gimber and Greg Mishevski all rapidly identified it, providing the following information and links. A photo of the church in 1895 (with less greenery), a drawing from the 1940's. The spire was subsequently removed in the 1950's, when other restoration work was carried out (link, see page 5, para 4). Church Plans On-line says that an application for a grant was made in 1951, so the spire was perhaps removed in the early 1950's. A modern photo. Link. Grade I listed - link.
Mistley, Mistley towers, the remains of Mistley Thorn Church, originally of 1735, later embellished by the towers added by Robert Adam in the late 1770's, and which remain today. A display board at the site includes an illustration of the church in its complete state. The grid reference  - TM 1159 3197 - is for the mid-point between the towers. Both © Karel Kuča (2019). Each tower is listed separately at grade I - they can be found here. St. Mary and St. Michael stands a little way S.W. of the ruin, at TM 1138 3177. It was seen by Streetview in 2021. Another Streetview, also from 2021. Link. Grade II listed. A former Methodist Church stands on Chapel Cut in New Mistley at TM 1216 3161. Originally Primitive Methodist, it's dated here to 1862, where it was said to still be active in 2015, but it has since closed, as sale notices can be found on-line. It can be seen on a Streetview from 2009.
Mount Bures, St. John the Baptist. © Roger Heap.
Mundon, St. Mary, redundant since 1970. TL 8797 0267. © Iris Maeers. Three more views - 1, 2, 3, and the porch, all © Karel Kuča (2007). Link. Grade I listed.

Navestock, St. Thomas the Apostle. © Peter Hobday.
Newport, St. Mary the Virgin. TL 5207 3411. © Marion Hall. and the font, all © Chris Stafford (2013). Link1. Link2. Grade I listed. The U.R.C. on the B1038, as seen by Streetview in 2010. TL 5178 3396. Link, which advises that it was previously a doctor's surgery. Older maps mark a Congregational Chapel, the predecessor of the U.R.C., towards the southern end of the village, at TL 5206 3369. The link for the previous entry gives a good history. The housing built on the site can be seen in a Streetview from 2019. West of the village, at Bonhunt Farm, is the ancient St. Helen's Chapel. Its Wikipedia entry says that there is an annual service here. TL 5115 3349. Grade II listed.
Noak Hill, St. Thomas. TQ 541 940. © Peter Hobday.
North End, Black Chapel, on Black Chapel Lane, a little way SW of the hamlet. Another view, and two of the interior - 1, 2. TL 6626 1794. All © Karel Kuča (2007). Link1. Link2. Grade I listed.
North Ockenon, St. Mary Magdalene. TQ 587 848. © Peter Hobday.
North Shoebury, St. Mary the Virgin. TQ 9286. © Julieanne Savage. An old postcard view, from Reg Dosell's Collection. Link.
North Stifford, St. Mary. © Mark Summers. Link.

Orsett, St. Giles & All Saints. © Brian Thompson.
Ovington, St. Mary (C). Another view. Both © Chris Stafford (2013). Link1. Link2. Grade II* listed.

Paglesham, St. Peter. © Roger Heap (2015). Link. Grade II* listed.
Pentlow, St. George and St. Gregory. TL 8126 4616. © Elizabeth Orbell. Two more views - 1, 2, both © Chris Stafford (2013). Link1. Link2. Grade I listed.
Pitsea, the remains of St. Michael. © Mark Summers.
Prittlewell, St. Mary the Virgin, has some fragments from as early as the 11th century, but is mostly 15th century. © Brian Thompson. Another view from an old postcard in Steve Bulman's Collection.

Quendon, St. Simon & St. Jude (K), undergoing refurbishment. Another view. TL 5155 3066. Both © Chris Stafford (2013). Two more views - 1, 2, and the porch, all © Karel Kuča (2019). Link. Grade II* listed.

Radwinter, St. Mary the Virgin. TL 6063 3728. From an old postcard in Steve Bulman's Collection. The postcard was badly faded, and has been heavily processed to recover as good an image as possible. Three modern views - 1, 2, 3, and the lych-gate, all © Karel Kuča (2019). Link. Grade II* listed. Older maps show a Mission Room to the NE of the village, on Ashdon Road at TL 6119 3769. It, or a later building on the same site, can be seen in a Streetview from 2011.
Ramsden Bellhouse, St. Mary. Another view, the wooden porch, and three views of the interior - 1, 2, 3. TQ 7192 9427. All © Karel Kuča (2007). Link. Grade II* listed. A Baptist Church stands a little way north, on Church Road, at TQ 7190 9454. It was seen by Streetview in 2009. Link.
Rawreth, St. Nicholas, a re-build of 1882. © Brian Thompson.
Rayleigh.
Rivenhall, St. Mary and All Saints on Church Road. The tower. TL 828 178. Both © Steve Taylor. Link.
Roydon, St. Peter. From an old postcard in Reg Dosell's Collection. Link.
Runwell, St. Mary. The tower, and the porch. TQ 7536 9440. All © Karel Kuča (2007). Link. Grade I listed. About a mile to the N.N.E. on St. Luke's Way, at TQ 7616 9589, is a grade II listed Chapel of 1837, part Runwell Hospital. It was seen by Streetview in 2018.

Saffron Walden, St. Mary the Virgin. TL 5373 3862. From an old postcard (franked 1904) in Steve Bulman's Collection. Another old postcard, from Christopher Skottowe's Collection. Link. Grade I listed. For other listed features associated with the church, see here.
St. Osyth, the gatehouse of the Priory, now a private residence. From an old postcard in Steve Bulman's Collection. Link.
Sewards End, St. James (1870-1). Interior view (taken through a window). Both © Chris Stafford (2013).
Shoeburyness, St. Andrew. From an old postcard, Geoff Watt's Collection. Link.
Silver End, St. Francis, on Boars Tye Road. Another view. TL 810 197. Link. St. Mary (R.C.) on Sheepcotes Lane. Another view. TL 810 200. Link. Silver End Congregational Church on Silver Street. Another view. TL 805 198. Link. All © Steve Taylor.
South Benfleet.
South Hanningfield, St. Peter. TQ 7444 9805. © Karel Kuča (2007). Link. Grade II* listed.
South Ockendon, St. Nicholas. TQ 594 829. © Neil Davies. Two other views, both © Jack Nicholson. 1, 2. Link1. Link2 (towards bottom of the page). Wesleyan Church (1847). © Jack Nicholson.
Southchurch, Holy Trinity. According to its web-site, the church was extended in the early years of the 20th century. The picture on this web-site would appear to date to before the modern works began. It's postmarked 1905. From an old postcard, Steve Bulman's Collection.
Southend-on-Sea, St. Laurence and All Saints at Eastwood. © Geoff Watt. Link.
Stanford-le-Hope, St. Margaret of Antioch, of Norman foundation, restored in Victorian times, it still retains much earlier stonework, and some fine carvings. Tombs and monuments of the Fetherston and Scratton families. © Brian Thompson.
Stansted Mountfitchet, St. Thérèse of Lisieux (R.C., 2002). An additional view. Both © Chris Stafford (2013). Link.
Steeple, St. Lawrence and All Saints. From an old postcard in Reg Dosell's Collection.
Steeple Bumpstead, St. Mary. Another view, three of the interior - 1, 2, 3, a window detail, a monument, and the font. TL 6790 4106. All © Chris Stafford (2013). Link. Grade I listed. A monument in the churchyard is listed separately as grade II. The Congregational Church on Chapel Street, as seen by Streetview in 2011. TL 6803 4115. Link. A Gospel Hall is shown on an O.S. map of 1960, at TL 6785 4137, on what today is The Chase. Two garages now stand on the site, seen here by Streetview in 2009.
Stock, All Saints. TQ 6877 9864. From an old postcard in Reg Dosell's Collection. Compare with the photo of bomb damage in WWII on this link. Three modern views - 1, 2, 3, the wooden porch, a door, and two of the interior - 1, 2, all © Karel Kuča (2007). Link. Grade I listed. Christ Church (Evangelical) on High Street, as seen by Streetview in 2021. Older maps label it as Congregational. TQ 6892 9883. Link. Our Lady and St. Joseph (R.C.) on Mill Road - seen by Streetview in 2021. What seems to be the same building is marked on older maps as a school. TQ 6913 9874. Link. What is likely to have been its predecessor can be seen on a map of 1922 - R.C. Church - at Lilystone hall south of the village at TQ 6853 9834. Nothing useful can be seen on Streetview because of roadside vegetation, but this source includes a photo of it. Lilystone Hall is grade II listed, but the entry makes no mention of the church.
Strethall, St. Mary the Virgin. © Marion Hall. Link. Grade I listed - link.

Thaxted, St. John the Baptist, Our Lady and St. Laurence. TL 6103 3101. From an old postcard in  Christopher Skottowe's Collection. A modern view, and the porch, both © Les Needham (2013). Another view, © Karel Kuča (2007). Link. Grade I listed. Baptist Church (1833) on Park Street. TL 6122 3079. © Les Needham (2013). Link. Grade II listed. U.R.C. on Bolford Street, which was originally Congregational. TL 6087 3096. © Les Needham (2013). Link.
Theydon Mount, St. Michael. TQ 492 992. © William Metcalfe. Link.
Thorpe-le-Soken, St. Michael. Another view. TL 1792 2230. Link. Grade II* listed. The Baptist Church stands well back from the High Street. TL 1798 2239. Link. Grade II listed. All © Karel Kuča (2007). The village also has a former Methodist Church, on Landermere Road. Originally Primitive Methodist, it's dated here to 1867-2002, and was seen by Streetview in 2017. TL 1804 2236.
Thundersley.
Tillingham, St. Nicholas. TL 993 038. © Tony Preston. "Peculiar People" Chapel (1858). © Iris Maeers. Link.
Tilty, St. Mary the Virgin. TL 5998 2651. © Les Needham (2013). Another two views - 1, 2, the porch, the interior, and the font, all © Karel Kuča (2019). Link. Grade I listed. The scant remains of Tilty Abbey stand to the north of the church. Not visible on Streetview, a photo and history are available here. TL 6002 2666.
Toppesfield, St. Margaret of Antioch. Wooden porch. TL 739 374. Both © Steve Taylor.

Vange, All Saints. © Mark Summers. Link.

Waltham Abbey.
Walton-on-the-Naze, All Saints on Church Road. An interior view, and the East window. Link. Grade II listed. Pentecostal Church on High Street. All © John Balaam (2019).
Warley - see Brentwood.
Wennington, St. Mary & St. Peter. TQ 539 809. © Peter Hobday. Link.
West Bergholt, St. Mary Old Church - no longer in use (redundant in 1975), and now in the care of the Churches Conservation Trust. © Roger Heap. St. Mary (the new church). Another view. Both © Roger Heap (2011). Grade I listed - link. Link (for both churches).
West Hanningfield, St. Mary and St. Edward. Another view. TQ 7350 9982. Both © William Metcalfe. Another view, all © Karel Kuča (2007). Link. Grade II* listed. An O.S. map of 1957 shows a place of worship at TQ 7255 9981. I haven't been able to discover what it was. As a small scale map it's difficult to be precise about where it stood, but it looks as if the wooden building seen here in a Streetview of 2009 could be it (or on the site of it). It has recently been demolished.
West Horndon, St. Peter, as seen by the Streetview van in 2009. Better images are available on Geograph, here. TQ 6044 8864. Grade I listed.
Westcliff on Sea, U.R.C. © Brian Thomson.
Wicken Bonhunt, St. Margaret. Another view, three interiors - 1, 2, 3, the pulpit and the font. All © Chris Stafford (2013). Link.
Wickham Bishops, St. Bartholomew. Another view. TL 837 120. Both © Steve Taylor (2010). Link.
Wickham St. Paul's, All Saints (K). Four further views - 1, 2, 3, 4. All © Roger Heap. Link. Grade II* listed - link.
Witham, Rickstones Evangelical Church on Rickstones Road. TL 820 159. © Steve Taylor. Link.
Wivenhoe, St. Mary the Virgin. TM 039 215. © Les Needham. Link.
Wix, St. Mary the Virgin. Some O.S. maps label it as St. Michael. Another view, and the bell-cage. TM 1635 2903. All © Karel Kuča (2007). Link1. Link2. Grade II listed. Google Streetmap aerial view shows a MCC Wix Methodist Community Church, and a link to a site that doesn't mention it. Another source says that it was for sale at some point. Seen by Streetview in 2021, the sign to the left of the big window says "Plymouth Brethren". Have they acquired the church recently? TM 1603 2838. Older O.S. maps show a Wesleyan Methodist Chapel on  Harwich Road at TM 1664 2850. The building on the site (Streetview 2021) appears to be a barn or shed, but does anything of the chapel survive? There was also a Primitive Methodist Chapel west of the village on Colchester Road at TM 1483 2783. It pre-dates a map of 1898. It stood just past the driveway seen in a Streetview from 2021.
Woodham Mortimer, St. Margaret, on Maldon Road. Another view. TL 822 052. Both © Steve Taylor (2011).
Wormingford, St. Andrew. Another view. Both © Roger Heap. Link. Grade I listed - link.
Wrabness, All Saints. Three more views - 1, 2, 3, and the font. The bell-cage is separately listed as grade II. TM 1742 3188. All © Karel Kuča (2007). Link. Grade II* listed. About ¾ of a mile south of the church is the site of a Wesleyan Methodist Chapel. Whether the building on the site (Streetview in 2009) is the converted chapel, or a later building, is unclear. It pre-dates a map of 1897, and ceases to be marked as a place of worship in the mid-20th century. TM 1740 3058. Another Chapel, now converted, stands nearby at TM 1750 3077. Seen by Streetview in 2021, it was Wesleyan, so likely to have been successor to the previous entry. The National Archives references documents pertaining to the Wrabness Wesleyan Chapel for the years circa 1845-1993 - 1845 must relate to the building of the first chapel, and 1993 to the closure of the second.
Writtle, All Saints. TL 6776 0614. © Geoff Watt. Another view, and the interior, both © Karel Kuča (2007). Link. Grade II* listed. U.R.C. (originally Congregational) on The Green. The church website advises of the closure of the church in 2019. Both © Geoff Watt.