County Donegal on Wikipedia.

Ardara, Methodist Church. © Graeme Harvey.

Ballintra, St. Brigid (R.C.). Link. Drumholm Parish Church (CoI). Methodist Church. All © Graeme Harvey.
Ballybrack, St. Mary. From an old postcard in Reg Dosell's Collection. Although the postcard gives the location as Moville (under which this entry was previously listed), Ben Palmer has advised that the present Parish Church is St. Pius, built in 1953 in Moville town centre. The old parish church is St. Mary, a couple of miles away in Ballybrack, which is still commonly used for marriages and burials. A modern view. © Ben Palmer.
Ballyshannon, St. Patrick (R.C.). Another view. Both © Graeme Harvey. An old postcard view, from Reg Dosell's Collection. Killbarron Parish Church (CoI). © Graeme Harvey. Former Presbyterian Church - services ceased in 2007. G 873 615. © Gerard Close. St. Joseph (R.C.), known locally as St. Josephs the Rock. G 871 611. © Gerard Close.
Bridgetown, Gospel Hall. © Graeme Harvey.
Bruckless, St. Conall and St. Joseph (R.C.). © Graeme Harvey.
Bundoran, Finner Parish Church (CoI). The former Presbyterian Church. Both © Graeme Harvey. Church of The Immaculate Conception. © Gerard Close. Former Methodist Church, now a coffee shop. G 821 591. © Gerard Close.

Carrickfinn. © Lorraine Waddington.
Castlefin, St. Mary (R.C.). © Graeme Harvey.
Clar, St. Agatha (R.C.). © Graeme Harvey.

Donegal.

Greencastle, St. Finian (CoI, 1738). © Ben Palmer (2006).
Gweedore. © Lorraine Waddington.

Killaghtee, St. Peter (CoI). © Graeme Harvey.
Killybegs, St. Mary. © Graeme Harvey.

Laghey, the Parish Church (CoI). © Graeme Harvey.
Letterkenny, St. Eunan's Cathedral (R.C.). © Graeme Harvey. An old postcard view, from Reg Dosell's Collection. Link. Trinity Presbyterian Church. © Graeme Harvey. Link. Conwal Parish Church (CoI). © Graeme Harvey. Link.
Lifford, Church of Slugadius (CoI). © Graeme Harvey.
Liscooley, Donoughmore Presbyterian Church. © Graeme Harvey.
Lough Eske, Christ Church (CoI). © Graeme Harvey.

Moville, St. Pius X (R.C., 1953). © Ben Palmer (2006). Link1. Link2.
Muckross, St. John (CoI). © Graeme Harvey.

Pettigo, Catholic Church. Templecarne Parish Church (CoI). Both © Graeme Harvey.

Rossnowlagh, Church of the Immaculate Heart of Mary (R.C.) at the Franciscan Friary. G 866 673. Link. Presbyterian Church (1906). G 878 672. Gerry advises that this is the only Tin Church still in use in Ireland. St. John (CoI). G 909 696. All © Gerard Close.

Shrove, St. Joseph (R.C.,1947). Both © Ben Palmer (2006). Link1. Link2.
Stranorlar.

Urney, Christ Church (CoI). © Graeme Harvey.