County Cork on Wikipedia.

Bandon, Methodist Church. From the postcard collection of Graeme Harvey.
Ballycotton, Star of the Sea (R.C.). Interior view. Link. Nearby is a former Church of Ireland church. All © Graeme Harvey.

Cloyne, St. Colman (R.C.). Another view. St. Colman's Cathedral (CoI). All © Graeme Harvey.
Cobh, St. Colman's Cathedral (R.C.). Seen here in an old postcard (in Steve Bulman's Collection). Although undated, it must pre-date the completion of the tower. The entire building was completed in 1915. And this postcard, from Reg Dosell's Collection, shows the completed tower. A modern view, © John Balaam (2009), and another, © John Watson. Interior view, © Graeme Harvey. Link.
Cork.

Dunmanway, St. Patrick (R.C.). St. Mary (CoI). Both © Graeme Harvey.

Enniskeane, Church of the Immaculate Conception (R.C.). © Alan Craxford. The link includes an early (architectural design?) drawing of this church, and there are some differences - see e.g. the spire. Link.

Fermoy, Christ Church (Church of Ireland). From an old postcard in Steve Bulman's Collection.

Gougane Barra, St. Finbarr's Oratory. © Carole Sage (2000).

Kilcredan, the ruins of the former Parish Church. © Graeme Harvey.
Killeagh, St. John the Baptist (R.C.). Interior view. Both © Graeme Harvey.
Kinsale.

Ladysbridge, St. Mary (R.C.). Interior view. Both © Graeme Harvey.

Mallow, the ruins of St. Anne. St. James (CoI). Link. Both © John Balaam (2009). St. Mary (R.C.). Interior view. Both © John Balaam (2010).
Midleton, Holy Rosary (R.C.). Interior view. St. John the Baptist (CoI). All © Graeme Harvey.

Queenstown - see Cobh above.

Shanagarry, Catholic Church of the Immaculate Conception. © Graeme Harvey. Link (scroll to bottom).

Youghal, Methodist Church. © Graeme Harvey.