Caerphilly on Wikipedia.

Aberbargoed, Caersalem Baptist Chapel has dates 1839 and 1860 (re-built). Hills Community Church. The former Moriah Baptist Church, now a nursery. All © Gerard Charmley (2011).
Aberbeeg, Christchurch. © Gerard Charmley (2011). Aberbeeg straddles the county boundary, so for the Methodist Church, see Blaenau Gwent.
Abercarn.
Abertridwr, Beulah Baptist Church. The former Nazareth Calvinistic Methodist Chapel, now a community centre. The former Gospel Hall, now a private residence. The former St. Peter. All © Gerard Charmley.
Abertysswg, St. Paul (CiW). Elim Tabernacle. Another view. Ainon Baptist Chapel has been demolished, but the congregation meet in the vestry. Similarly, Jerusalem Calvinistic Methodist Chapel has also been demolished, and again, the vestry (which bears the date 1903) is now used. Another view. All © Gerard Charmley (2011).

Bargoed, the Parish Church. Derelict former Mission Church. Calfaria Welsh Independent Church (1910). The former Hanbury Baptist Church, undergoing conversion. St. Peter's on the Graig (R.C.). Salvation Army Hall. All © Gerard Charmley (2011).
Bedwas.
Bedwellty, St. Sannan. © David Gallimore. Another view. © Gerard Charmley (2011).
Berthlwyd, the former Baptist Chapel, now in residential use. © Gerard Charmley (2011).
Blackwood, Spiritualist Church on High Street. © Janet Gimber (2015). Link.
Brithdir, St. David. © Gerard Charmley (2011).

Caerphilly.
Cefn Fforest, St. Thomas (CiW). Link. Bethany Baptist Chapel. Link. Trinity Welsh Presbyterian Church. All © Gerard Charmley (2011).
Cefn Hengoed, St. Anne. Bethel Baptist Chapel (1933). Both © Gerard Charmley (2011).
Craig-y-Raca. Marked on maps as a church, can you give it a name? © Gerard Charmley (2010).
Crosskeys, St. Catherine (CiW). Gerard advises that there wasn't a notice board, so is this church closed? Hope Baptist Chapel (1880). Crosskeys Methodist Church. Crosskeys Pentecostal Church. All © Gerard Charmley (2011).
Crumlin, the former St. Mary (CiW). Bethel Baptist Church. The former Hillside Methodist Church. Rock Gospel Hall. All © Gerard Charmley (2011). Standing just east of Crumlin at ST 2291 9897 lies Hafodyrynys Congregational Chapel. Another view. ST 2291 9897. Both © Martin Richter (2012). The Coflein entry (which includes two photos) dates it to 1894.
Cwmcarn, St. John the Evangelist (1934). The former St. Winefride (R.C.). Zion Baptist Church was started in 1912, but never finished- only the school buildings were built. The former Kingdom Hall of Jehovah's Witnesses, closed 2003. All © Gerard Charmley (2011).
Cwmfelinfach, Bethany Calvinistic Methodist Chapel. © Gerard Charmley (2011).

Eglwysilan, St. Ilan. Of 6th century origin, the church served the valley before industry developed, and now stands alone. © Gerard Charmley. Link.

Fleur de Lys, English Congregational Chapel (1903). Mount Zion Methodist Chapel (originally Primitive Methodist, 1870). Both © Gerard Charmley (2011).

Gelligaer, St. Catwg. Link. Horeb Welsh Baptist Chapel (founded 1848). Both © Gerard Charmley (2011).
Gilfach, St. Margaret. © Gerard Charmley (2011). Link.
Groes-Wen, Groeswen Independent Chapel. Gerard advises that it is one of the oldest Non-Conformist chapels in South Wales. Another view. The white building is part of the original structure. Both © Gerard Charmley.

Hengoed, Baptist Chapel - bears dates 1710 and 1829. Cascade Methodist Church. Both © Gerard Charmley (2011).

Llanbradach.
Llanfabon, St. Mabon. © Gerard Charmley (2011).

Machen, St. John the Baptist (CiW). Emmanuel Church (Assemblies of God). Ebenezer Evangelical Baptist Church. All © Gerard Charmley (2010). Of the demolished Siloam Chapel, nothing remains except the vestry. © Gerard Charmley (2011).
Maesycwmmer.
Mynyddislwyn, St. Tudor (CiW). New Bethel (U.R.C.). Another view. The statue looking down is of James Thomas, a local mine-owner, who attended this chapel. All © Gerard Charmley (2011).

Nelson, the Parish Church. Bethel Evangelical Church. Link. Salem Methodist Church. Penuel Congregational Church (1857). Calfaria Baptist Church. All © Gerard Charmley (2011).
New Tredegar, St. Dingat. Carmel Baptist Church. Former Chapel (1898), converted to a workshop ca. 1920. The vestry of a demolished Congregational Chapel. All © Gerard Charmley (2011).
Newbridge.

Oakdale, Presbyterian Church (1916). Baptist Church. Methodist Church. All © Gerard Charmley (2011).

Pengam, St. David (CiW). © Gerard Charmley (2011). The former Capel y Bont Baptist Chapel (now a private residence) has dates 1857 and 1865. © Gerard Charmley (2011). Ebenezer English Baptist Chapel (1907). © Gerard Charmley (2011). Link. The chapel has been considerably extended and refurbished as this photo of 1988 (© Bruce Cunningham) shows. A former chapel on Station Road, Glan Y Nant - Janet Gimber advises that this was Nazareth Methodist Chapel. © Gerard Charmley (2011).
Penmaen, St. David (CiW). Independent Chapel, the fellowship of which claims its origin in 1639-40. The tablet also lists dates of 1694, 1829, and 1888. Both © Gerard Charmley (2011).
Penybryn, Calvary Evangelical Church. © Gerard Charmley (2011).
Pontllanfraith.
Pontlottyn, Caerphilly, Parish Church. The former English Calvinistic Methodist Chapel. Elim Community Church. All © Gerard Charmley (2011).
Pontmister, St. Margaret (CiW). Clyde Street Pentecostal Church. Ty Isaf Baptist Church. All © Gerard Charmley (2011).
Pontywaun, Trinity Congregational Church (1870). © Gerard Charmley (2011).

Rhudry - see Rudry.
Rhymney.
Risca.
Rudry (or Rhudry), St. James. © David Gallimore. Another view. © Gerard Charmley (2010). Link. Former Ebenezer English Congregational Church, now in residential use. © Gerard Charmley (2010).

Senghenydd, St. Cenydd. U.R.C. Both © Gerard Charmley. The former Ebenezer Baptist Church, now flats. © Gerard Charmley (2011). The former Seion Wesleyan Chapel, now a private residence. © Gerard Charmley. Salvation Army Hall. © Gerard Charmley (2011). The site of the demolished Noddfa Welsh Congregational Chapel. © Gerard Charmley (2011).

Trethomas, St. Thomas' Christian Centre (CiW). Trethomas Christian Fellowship. Unidentified church on Navigation Street - Howard Richter has advised that this church (at ST 181 888) was Bethany (Assemblies of God) Pentecostal in 1960-2, and Pentecostal in 1970-3. He has also advised that this former chapel, at ST 182 887 (now a nursery), was Penuel Welsh Congregational. All © Gerard Charmley (2010).
Ty Sign, St. David' Methodist Church, shared with the Church in Wales. © Gerard Charmley (2011).

Ynysddu, St. Theodore (CiW). Babell Calvinistic Methodist Chapel, where lies the poet William Thomas, otherwise known as Islwyn. Both © Gerard Charmley (2011).
Ystrad Mynach, Holy Trinity (CiW). Shiloh Calvinistic Methodist Church. Bethany U.R.C. Bryn Seion Baptist Church. Lewis Street Methodist Church. All © Gerard Charmley (2011).