The Parish Source Guide has been organised by county. Each of the county pages includes a map showing the network of civil parishes in that county with a listing of those parishes and links to the individual guides.

The civil parish network in Ulster has been subject to change over the last four centuries. For example, the parish of Keady in Co. Armagh was created out of Derrynoose parish in 1773. Researchers interested in Keady should also refer to the entry for Derrynoose for additional source material.