PRONI Historical Maps viewer can be used to search and browse seven historical OSNI maps and four modern basemaps (including aerial imagery). The viewer displays county, parish and townland boundaries and includes information on sites, buildings and landmarks of historical interest. A variety of tools and 'widgets' enable you to search and browse the maps, compare one map with another, and find various points of historical interest. Find summary guidance on using the application below, or open the 'Help' widget in the Historical Maps viewer for a detailed description of to use the various functions.

Time Periods for the Various Editions relating to County Tyrone

1st Edition - 1834

2nd Edition - 1857

3rd Edition - 1906

4th Edition - 1955

Link to PRONI Historic Map Viewer