County Roscommon on Wikipedia.

Athleague, St. Patrick (R.C., 1842). M 830 575. © Gerard Close (2017). Link.

Ballaghaderreen, The Cathedral Church of the Annunciation of the Blessed Virgin Mary and St. Nathy, (R.C.). Two further views - 1, 2. All from old postcards in Reg Dosell's Collection. Link.
Boyle, St. Joseph (R.C.). From an old postcard in Reg Dosell's Collection. Joseph Cantwell has advised that this church was destroyed in a fire in 1977. The new church of St. Joseph (R.C.). Interior view. Both © Joseph Cantwell (2012). Adoration Chapel was used as the parish church from the destruction of the old church, until the new one was built. Another view. Both © Joseph Cantwell (2012).

Castlerea, St. Patrick (R.C., 1903). The tower was added in 1916. M 873 643. © Joseph Cantwell (2012). Interior view, and the East window, both © John Balaam (2016).
Cloonyquinn, St. Catherine (R.C.), which is also known as Killina Church. M 847 839. © Gerard Close (2017). Link.

Roscommon, Sacred Heart (R.C.). © Joseph Cantwell. Another view, © Gerard Close (2017).