Caerphilly on Wikipedia.

Aberbargoed, St. Peter on Commercial Street and Church Street, as seen by Streetview in 2021. SO 1569 9985. Link. Caersalem Baptist Chapel on Bedwellty Road has dates 1839 and 1860 (re-built). SO 1525 0030. © Gerard Charmley (2011). Hills Community Church on the A4049. Between mid-2021 and late 2022 this had become Awaken House of Prayer (2022 Streetview). SO 1550 0015. © Gerard Charmley (2011). The former Moriah Baptist Church, now a nursery, stands at the junction of the B4511 and Pant Street. It's dated here to 1923. SO 1551 0030. © Gerard Charmley (2011). A mid-20th century 1" O.S. map shows a place of worship on Heol Ysgol Newydd, but what it was is unknown. It will have stood on the right of the road seen in a 2009 Streetview. SO 1542 0009.
Aberbeeg, Christchurch. Coflein dates it to 1907-9, successor as parish church to St. Illtyd. A 2012 news item, discussing its proposed closure, states that it was then 102 years old. Its lack of internet presence suggests that it did indeed close. SO 2075 0160. © Gerard Charmley (2011). Grade II listed. Aberbeeg straddles the county boundary, so for St. Illtyd and the Methodist Church, see Blaenau Gwent.
Abercarn.
Abertridwr, Beulah Baptist Church, which stands on Thomas Street and Cross Street. It bears a date-stone for 1905, but its Coflein entry says that it was built in 1902 and modified in 1905. ST 1226 8927. © Gerard Charmley. The signage to the left of the entrance shows that Abertridwr Community Church also meets here (2023 Streetview). The former Nazareth Calvinistic Methodist Chapel on Thomas Street, now a community centre. Its Coflein entry dates it to 1898, re-built in 1908, and closed "by 1998". ST 1209 8937. © Gerard Charmley. The former Gospel Hall off Lower Francis Street, now a private residence. ST 1181 8921. © Gerard Charmley.
Abertysswg, St. Paul (CiW). SO 1302 0556. © Gerard Charmley (2011). Older O.S. maps mark, immediately south of the church at SO 1301 0553 on Alfred Street, a former Chapel. So far unidentified, it, or the building which replaced it, was seen by Streetview in 2009. Its Coflein entry also doesn't identify it. St. Paul can be seen in the background. Elim Tabernacle on Warn's Terrace. Streetviews show that it had been closed and demolished between 2011 and mid 2021. Another view. SO 1281 0568. Both © Gerard Charmley (2011). Ainon Baptist Chapel has been demolished, but the congregation meet in the vestry. According to its Colflein entry, the chapel was built in 1906, and demolished by 1997. SO 1296 0563. © Gerard Charmley (2011). Jerusalem Calvinistic Methodist Chapel on Alexander Street bears the date 1903. Another view. SO 1305 0567. Both © Gerard Charmley (2011). Link. The former Bethania Welsh Independent Chapel stood on Walter Street at SO 1309 0557, and is dated by Coflein to 1902. It, or the building which replaced it, was seen by Streetview in 2009.

Bargoed.
Bedwas.
Bedwellty, St. Sannan. SO 1666 0031. © David Gallimore. Another view, © Gerard Charmley (2011). Link. Grade II* listed. Coflein entry.
Blackwood.
Brithdir, St. David (CiW), on Station Road. SO 1522 0199. © Gerard Charmley (2011).

Caerphilly.
Cefn Fforest - see  Blackwood.
Cefn Hengoed, St. Anne, on Hengoed Road. Its Wikipedia article dates it to 1939, with closure during or before 2015. Coflein has it as Cefn Hengoed Mission Church. ST 1463 9621. © Gerard Charmley (2011). Bethel Baptist Chapel (1933) on Gelligaer Road. Visible in a 2022 Streetview, signage added since Gerard's visit now calls the church Hope Church. ST 1467 9580. © Gerard Charmley (2011). Link.
Craig-y-Raca. Marked on maps as a church, can you give it a name? © Gerard Charmley (2010).
Crosskeys, St. Catherine (CiW) stands at the junction of Gladstone Street and Woodward Road. Gerard advises that there wasn't a notice board, so is this church closed? Added in 2023 - this source confirms that it is closed. ST 2205 9190. © Gerard Charmley (2011). Hope Baptist Chapel (1880) on High Street and Oak Terrace at ST 2208 9211. Its Coflein entry dates it to the late C19. © Gerard Charmley (2011). Crosskeys Methodist Church on High Street. Coflein dates it to the late C19, as Wesleyan. ST 2204 9235. © Gerard Charmley (2011). Link. Crosskeys Pentecostal Church on Gladstone Street. ST 2180 9167. © Gerard Charmley (2011). Link. The Pentecostal Church stands immediately adjacent to a roadside building, marked as Chapel on an O.S. map of 1902. it seems to have survived as the building seen here in a Streetview from 2011. Presumably now part of the Pentecostal church, what was it originally? A Primitive Methodist Chapel used to stands just a few yards west of St. Catherine at ST 2202 9188. Coflein says it was "likely built in 1893". Now demolished, the car park on its site can be seen in the earliest available Streetview from 2009. An old postcard of the chapel can be seen here. Pontywaun Christian Spiritual Church on Hall's Road Terrace, as seen by Streetview in 2021. ST 2205 9251. The former Trinity Congregational Chapel is on Trinity Hill. Its grade II listing dates it to 1870. ST 2210 9254. © Gerard Charmley (2011). Coflein entry.
Crumlin, the former St. Mary (CiW) on Hafodyrynys Road, at ST 2143 9848. © Gerard Charmley (2011). Bethel Baptist Church on Hafodyrynys Road at ST 2148 9846. Coflein has an entry for this chapel (photos here), but calls it Jerusalem, and Bethel. I haven't been able to determine if it was known by both names, or if this is an error. It dates it to 1906, a re-build of an earlier chapel of 1897. © Gerard Charmley (2011). The former Hillside Methodist Church, on Hillside. Coflein, which calls it Whitethorn Street Calvinistic Methodist Chapel, dates it to "after 1910" to circa 1980. ST 2119 9837. © Gerard Charmley (2011). Rock Fellowship Gospel Hall on Kendon Road. This became Elevate Church in 2022 (link). Circa ST 2098 9851. © Gerard Charmley (2011). Standing just east of Crumlin at ST 2291 9897 lies Hafodyrynys Congregational Chapel. Another view. Both © Martin Richter (2012). The Coflein entry (which includes two photos) dates it to 1894.
Cwmcarn, St. John the Evangelist on Park Street. A 2022 news article says it was closed "seven years ago", so about 2015. ST 2218 9363. © Gerard Charmley (2011). Coflein dates St. John to "about 1925", and says it was successor to an earlier church "on the opposite side of the road". This seems to be incorrect as a map of 1902 shows St. John's Church in exactly the same location as the surviving church. The former St. Winefride (R.C.). © Gerard Charmley (2011). Zion Baptist Church was started in 1912, but never finished - only the school buildings were built. © Gerard Charmley (2011). The former Kingdom Hall of Jehovah's Witnesses, closed in 2003. © Gerard Charmley (2011).
Cwmfelinfach, the former Bethany Calvinistic Methodist Chapel (1912) on Commercial Road. ST 1849 9184. © Gerard Charmley (2011). The 1951 1" O.S. map shows a place of worship on an apparently un-named narrow road at ST 1863 9170. It survived long enough to allow the first Streetview to see it in 2009, and enough of the date-stone can be seen to read that it was called Noddfa, and possibly from 1911. The next Streetview visit was in 2021, by which time it had been demolished. Its Coflein entry (written in 2011) says that it "appears to be the Sunday School built at the rear of a now-demolished chapel". This would imply that the chapel stood on the grassy area seen in 2009. Buildings were being built on the site in 2021. Capel y Babel, where lies the poet William Thomas, otherwise known as Islwyn. Its dated here to 1827, as Presbyterian. ST 1857 9141. © Gerard Charmley (2011).

Eglwysilan, St. Ilan. Of 6th century origin, the church served the valley before industry developed, and now stands alone. ST 1066 8900. © Gerard Charmley. Link. Coflein. Grade II listed.

Fleur de Lys, St. David (CiW) on Commercial Street. ST 1546 9703. © Gerard Charmley (2011). Link. English Congregational Chapel (1903) on High Street. ST 1548 9683. © Gerard Charmley (2011). Mount Zion Methodist Chapel (originally Primitive Methodist, of 1870) on Gellihaf Road. ST 1564 9656. © Gerard Charmley (2011). A 1920 map shows a Misn. Rm. just a few yards further south at ST 1565 9653. The 2009 Streetview shows the house on the site, possibly the converted hall. A 1919 O.S. map shows a S.A. Hall with adjacent Burl. Gd. on Ivor Street, at ST 1555 9683. Demolished by the mid-20th century, its now grassy site was seen by Streetview in 2022. The 25" O.S. map of 1920 shows a so far unidentified Capel on High Street, at ST 1556 9674. The housing built on the site was seen by Streetview in 2021. The Wesleyans also had a Chapel in the town, set back on the west side of Victoria Road at ST 1557 9640. It site is behind the bungalow seen here in a Streetview from 2021.

Gelligaer, St. Catwg. ST 1356 9693. © Gerard Charmley (2011). Link1. Link2. Coflein. Grade II listed. Horeb Welsh Baptist Chapel (founded 1848) on Castle Hill. It now seems to be closed - see the boarded-up windows in a 2021 Streetview. ST 1364 9698. © Gerard Charmley (2011). Coflein. Grade II listed, wherein it's dated to 1848. Mount Zion Pentecostal Church on South View Houses, as seen by Streetview in 2021. ST 1365 9683. Somewhat over 1½ miles to the N.N.W. of the village are the scant remains of Capel Gwladys, which its Coflein entry (photos here) states dates from circa 450. ST 1248 9928.
Gilfach, St. Margaret of Antioch (dedicated in 1933), as seen by Streetview in 2022. ST 1509 9863. Link. This source says that this is the third St. Margaret, the other two both stood nearby, and both have been demolished. One of these can be located on older O.S. maps a short distance to the N.E. at ST 1512 9865. The housing on the site was seen by Streetview in 2022. Ainon Baptist Church is on Maes-Y-Graig Street, and was seen by Streetview in 2021. It has a date-stone for 1902. ST 1518 9851. A Congregational Chapel used to stand on Gwerthonor Road. Map evidence shows it was built between 1901 and 1919. Its Coflein entry calls it Tabernacl Independent Chapel, and says it was closed "by 1997", but I suspect several decades earlier, as it isn't labelled as a place of worship on a map of 1965.
Groes-Wen, Groeswen Independent Chapel. Gerard advises that it is one of the oldest Non-Conformist chapels in South Wales. Coflein says it was "first built in 1742", with subsequent re-builds and enlargements. Another view. The white building is part of the original structure. ST 1280 8700. Both © Gerard Charmley. Grade II* listed.

Hengoed, Baptist Chapel, set well back from Hengoed Road. It bears the dates 1710 and 1829. ST 1482 9540. © Gerard Charmley (2011). Coflein. Grade II listed.

Llanbradach.
Llanfabon, St. Mabon. Coflein describes it as a re-build of 1847 of a medieval predecessor. ST 1084 9384. © Gerard Charmley (2011). Grade II listed. A grade II listed memorial in the churchyard commemorates the nearly 300 who perished in the Albion Colliery disaster in 1894.

Machen, St. John the Baptist (CiW). Its Coflein entry dates it to 1854-5. ST 2126 8930. © Gerard Charmley (2010). Link. Grade II listed. The war memorial in the churchyard is also listed, as grade II. Emmanuel Church (Assemblies of God) on Forge Road. ST 2102 8912. © Gerard Charmley (2010). Ebenezer Evangelical Baptist Church on Wyndham Street. According to Coflein, the first chapel on the site dates from 1820, but was re-built in 1851 and again in circa 1900, with closure and conversion "by 1997". ST 2107 8930. © Gerard Charmley (2010). Of the demolished Siloam Chapel, nothing remains except the vestry. © Gerard Charmley (2011). Siloam Chapel itself stood on Commercial Road at ST 2098 8921. The car park on its site was seen by Streetview in 2023. A Methodist Chapel used to stand in the interior corner of a corner plot on Crown Street and Commercial Road. I've been unable to discover which flavour of Methodism it was, but it pre-dated a map of 1901 and remained active until the mid-20th century at least. Coflein dates it to 1882. Demolished, it stood about where the middle house is of the three seen here in a Streetview from 2023. ST 2171 8898. Also marked on older O.S. maps is an Independent Chapel at the corner of Wyndham Road and Lewis Street. Other than the map evidence which shows that it was built before 1901, and was probably still active in 1964, I've been unable to discover any material pertaining to this chapel. The middle and right hand houses seen in a Streetview of 2023 stand on the site. ST 2114 8931. 
Maesycwmmer.
Mynyddislwyn, St. Tudor (CiW). Coflein says it was severely damaged in a fire in 1800, and was "largely rebuilt and expanded in 1819-20". ST 1934 9391. © Gerard Charmley (2011). Link. Grade II* listed. The lych-gate is also listed, as grade II. New Bethel (U.R.C.), about a mile north of St. Tudor. Coflein dates it to 1765, but its grade II listing agrees that the first chapel was of 1765, but it was re-built in 1855. Another view. The statue looking down is of James Thomas, a local mine-owner, who attended this chapel. ST 1922 9542. Both © Gerard Charmley (2011). Numerous churchyard monuments are also listed - see here.

Nelson, the Parish Church, St. John the Baptist. Coflein dates it to 1887-9, with the tower added in 1904. ST 1105 9554. © Gerard Charmley (2011). Link. Bethel Evangelical Church on Heol Fawr. Coflein, which calls it Ebenezer (as do older O.S. maps), says it's the third chapel on the site, dating from 1874, with predecessors of 1831 and 1796. However, the current church website history page says that the first chapel of 1832 still survives as the adjacent Sunday school and vestry (2021 Streetview, Bethel at the right). ST 1149 9520. © Gerard Charmley (2011). Link. Salem Methodist Church on High Street. Older maps show it to have been Primitive Methodist. It's dated by Coflein to 1894, a re-build of an earlier chapel of 1859. Streetviews show that between 2016 and 2021 it was closed, and became the premises of a funeral director. ST 1119 9557. © Gerard Charmley (2011). Penuel Congregational Church (1857) on High Street has a date-stone for 1857. ST 1112 9553. © Gerard Charmley (2011). Coflein. Calfaria Baptist Church on Wern Crescent. Coflein gives a date of 1878. ST 1141 9552. © Gerard Charmley (2011).
New Tredegar.
Newbridge.

Oakdale (including Penmaen), St. David (CiW) on Central Avenue, Penmaen, as seen by Streetview in 2021. ST 1837 9820. Link. Coflein. The Presbyterian Church (1916) on Penmaen Avenue and Maesygarn Road. ST 1882 9861. © Gerard Charmley (2011). Link. Coflein. Baptist Church on Markham Crescent. Its brief Coflein entry dates it to the early 20th century. ST 1847 9849. © Gerard Charmley (2011). Methodist Church on Central Avenue and Kincoed Road. At some point before 2021 (Streetview) it had become Oakdale Christian Centre. ST 1850 9826. Coflein says it was built as Wesleyan in the early 20th century. © Gerard Charmley (2011). Link. Penamen Independent Chapel on Oakdale Terrace. Its Coflein entry dates it to a re-build in 1828 of an earlier chapel of 1694. ST 1817 9773. © Gerard Charmley (2011).

Pengam, the former Capel y Bont Baptist Chapel (now a private residence) on Commercial Street has dates 1857 and 1865. ST 1551 9730. © Gerard Charmley (2011). The chapel had been re-painted a rather fetching blue by 2022 (Streetview). Ebenezer English Baptist Chapel (1907) on River Terrace. ST 1543 9751. © 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. ST 1507 9751. © Gerard Charmley (2011).
Penmaen - see Oakdale, above.
Penpedairheol, Cascade Methodist Church, off Pengam Road. ST 1429 9752. © Gerard Charmley (2011). Link.
Penybryn, Calvary Evangelical Church. © Gerard Charmley (2011).
Pontllanfraith.
Pontlottyn.
Pont-y-mister - see the Risca and Pont-y-mister page.

Rhudry - see Rudry.
Rhymney.
Risca and Pont-y-mister.
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. Peter and St. Cenydd (CiW, originally St. Peter) on Commercial Street. ST 1182 9045. © Gerard Charmley. Link. Older O.S. maps show a church of St. Genydd (with a "G") on the Caerphilly Road at ST 1192 9033. Built between 1898 and 1915 (from the revision dates of maps of 1901 and 1920), it remained active at least into the mid-20th century. Genuki mentions baptism records for 1909-1947. Demolished at some point, flats now stand on the site, seen by Streetview in 2023. U.R.C. on Commercial Street, marked on older maps as Congregational. ST 1176 9049. © Gerard Charmley. The former Ebenezer Baptist Church on Caerphilly Road, now flats. ST 1201 9011. © Gerard Charmley (2011). The former Seion Wesleyan Chapel on Caerphilly Road, now a private residence. ST 1196 9017. © Gerard Charmley. Salvation Army Hall on High Street. Old maps show that Capel Salem used to stand here. ST 1168 9078. © Gerard Charmley (2011). An earlier S.A. Hall stood just east of the southern end of Clive Street. So marked on the 25" O.S. map of 1920, the 6" map of 1901 labels it as Chapel. The house on the site today was seen by Streetview in 2021. ST 1177 9070. The former St. Peter on Gelli Terrace. The 25" O.S. map of 1920 labels it as R.C. Ch. Other maps suggest it was active at least into the mid-20th century. ST 1205 9005. © Gerard Charmley. Gerard believes this site, on a small piece of land bounded by Cross Street, High Street and Stanley Street, is where the demolished Noddfa Welsh Congregational Chapel stood. ST 1163 9088. © Gerard Charmley (2011). There was certainly a Capel here, though otherwise unidentified on available maps, but Noddfa's Coflein entry (which provides dates of 1898 to mid-20th century) locates it on a different site, at ST 1171 9066, on Commercial Street and Caerphilly Road. There was also certainly a Capel here, again unidentified on available maps, and this site was seen by Streetview in 2023. Can you clarify this confusion? Another so far unidentified Chapel stood on Stanley Street at ST 1163 9083. In this 2023 Streetview, the chapel stood at the left hand side of the car park.

Trethomas, St. Thomas' Christian Centre (CiW) on Heol Yr Ysgol. ST 1797 8878. © Gerard Charmley (2010). Link. Trethomas Christian Fellowship on Standard Street. ST 1820 8899. © Gerard Charmley (2010). Link. Unidentified church on Navigation Street - Howard Richter has advised that this church (at ST 1808 8879) was Bethany (Assemblies of God) Pentecostal in 1960-2, and Pentecostal in 1970-3. It seems to be the same building marked as Meth Chap on a map of 1960, and  called by Coflein Roman Catholic (here), Primitive Methodist (here), and Pentecostal (here). © Gerard Charmley (2010). Howard has also advised that this former chapel at ST 1818 8872 (now a nursery), was Penuel Welsh Congregational Chapel. © Gerard Charmley (2010).

Ynysddu, St. Theodore (CiW). It's dated by Coflein to 1925. ST 1823 9220. © Gerard Charmley (2011). Link. An otherwise unidentified Chap. shows on the 6" O.S. map of 1901 at ST 1792 9282. In a 2023 Streetview, its site lies beneath the parked vehicles behind the "Select" sign. Coflein identifies it as Methodist, of 1895, and says that in 2002 it "appeared to be in use as a chapel". Capel Twyn-gwyn shows on old maps at ST 1827 9273. Converted to residential use, Streetview saw it, and the attached burial ground, in 2023. Its Coflein entry dates it to 1829, with conversion "by 1997". Sardis Chapel, which has a date-stone for 1909, stands on an apparently un-named side road off High Street, at ST 1801 9241. A news article says it was U.R.C. in 2000. Streetview saw it in 2023.
Ystrad Mynach, Holy Trinity (CiW, on Cedar Way), which Coflein dates to 1855-6. ST 1439 9416. © Gerard Charmley (2011). Link. Grade II listed. Shiloh Bapist Chapel on Oakfield Street. ST 1460 9438. © Gerard Charmley (2011). Coflein. Bethany U.R.C. on Lisburn Road. ST 1442 9430. © Gerard Charmley (2011). Bryn Seion Baptist Chapel on Lisburn Road. Coflein dates it to the mid-19th century, but it doesn't appear on a map of 1901. ST 1450 9431. © Gerard Charmley (2011). Lewis Street Methodist Church. ST 1443 9443. © Gerard Charmley (2011). Link. The former Moriah Independent Chapel (2010 Streetview). ST 1471 9449. Link. English Baptist Mission (2021 Streetview) is on Central Street. ST 1447 9424. Link.