Watford on Wikipedia.

All Saints on Horseshoe Lane, Leavesden Green. From an old postcard in Reg Dosell's Collection. A 2019 Streetview provides a modern view. TL 1148 0087. Link1. Link2. Grade II listed.

Beechen Grove Baptist Church stands on Beechen Grove and Clarendon Road, and was seen by Streetview in 2024. TQ 1102 9665. Link. Grade II listed wherein it's dated to 1877. 

Cornerstone Church (2022 Streetview) is on Vicarage Road and Banbury Street, at TQ 1055 9582. This source (many photos) says it used to be known as West Watford Christian Fellowship), and that it was built as a Wesleyan Mission Church in 1893. The 25" O.S. map of 1898 labels it as Wesleyan Mission Room. Facebook.

Derby Road Baptist Church (2024 Streetview) stands on Derby Road and Grosvenor Road at TQ 1129 9647. Link, which says that the church has been on this site for 133 years. Its grade II listing, which calls it The Baptist Tabernacle, dates it to 1887.

Holy Rood (R.C.) stands at the junction of Market Street and Percy Road - 2024 Streetview. TQ 1087 9633. Link. Grade I listed, wherein it's dated to 1889-1900.

Kingswood Baptist Church on North Approach, Leavesden Green. TL 1020 0013. © Les Needham. A 2017 news article records its then recent closure. I haven't been able to discover when the building was put up, but mid-20th century maps don't indicate a place of worship here. Two other Baptist Chapels (both on High Road) are shown on older O.S. maps. The map of 1883 shows one at TL 0997 0020. It seems  to have already gone out of use by 1896. Its site was seen by Streetview in 2024. The next Baptist Chapel  had been built by 1896, a little way further north, at TL 1006 0050. The building on the site today is blurred out on Streetview, but I don't think the chapel has survived. It was still active at least to 1939, and is commemorated in the street name Chapel Close next to its site - 2019 Streetview.

Leavesden Road Baptist Church, on Leavesden Road and Garfield Street, as see by Streetview in 2024. An un-dated (at least as regards the year) news article says that it had been closed since 2021, and that planning permission to turn it into a mosque had been refused. Nevertheless, in 2026, Google maps was labelling it as Watford Islamic Centre. Its grade II listing dates it to 1895-1909.

The cemetery on Vicarage Road used to have two Mortuary Chapels. The Nonconformist stood at TQ 1059 9612, and the Church of England at TQ 1066 9603. Only the latter survives - 2016 Streetview.

Oasis City Church Watford meets in Leonardo's Hotel (2024 Streetview) on Clarendon Street. TQ 1096 9669. Link.

St. Andrew on Church Road, as seen by Streetview in 2008. It's dated in its grade II listing to 1853-7, by Teulon. TQ 1069 9761. Link.

St. James Road Baptist Church (2024 Streetview) stands on St. James Road and Farraline Road at TQ 1081 9600. Link. The church history page advises that the first church on the site was a tin tabernacle, opening in 1903, with the present church dating to 1965-6.

St. John is on Sutton Road, and was seen by Streetview in 2024. TQ 1119 9674. Link. The history page dates it to 1891-3, preceded by a tin tabernacle (there is a photo) from 1873. Grade II listed.

St. Mary. TQ 1107 9631. From an old postcard in Steve Bulman's Collection. A 2020 Streetview provides a modern view. A comprehensive church guide can be found here. Link. Grade I listed. See here for related listed features.

St. Michael and All Angels stands on a triangular plot between Mildred Avenue and Durban Road West, at TQ 1015 9632. Streetviews from 2024, 2021. Link. The history page dates it to 1913, preceded by a smaller church which still stands adjacent, now serving as the church hall - 2024 Streetview.

St. Thomas (U.R.C.), on Langley Road, as seen by Streetview in 2021. A 2026 news article says it "has not been in use as a church since 2021" and that it's awaiting a planning decision about turning it into a mosque. TQ 1046 9745.

Watford Christian Spiritualist Church is on Estcourt Road - 2024 Streetview TQ 1109 9701. Link says they have been in the present building since 1989, having previously been on Queens Road since 1920. Can you advise where this was exactly?

The Watford Union Workhouse on Vicarage Road had a Chapel, at TQ 1051 9574. Some  photos of it (scroll down) can be seen here (where it's called St. Barnabas, demolished circa 1962). Its site now serves as an outdoor seating area for the hospital - 2024 Streetview.

Wellspring Church on Wellspring Way and Pump House Lane, as seen by Streetview in 2024. TQ 1137 9599. Link.

West Watford Free Church (Baptist) (2024 Streetview) stands at the junction of Croxley View and Tolpits Lane, at TQ 0963 9536. Link.