Here are some details about Co. Mayo based on data in OpenStreetMap. (Debug overlaps and coverage)

Mayo is on Logainm.ie: Mayo.

Area

Mayo has an area of 5,598.2 km² / 1,383,354.9 acres / 2,161.5 square miles.

Mayo has a total water area of 222,334,473.5 m², which is 4.0% of the total area

Baronies

There are 7 baronies in Co. Mayo that we know about. You may wish to compare this list (below) with Wikipedia's list of baronies in Mayo.

Civil Parishes

There are 73 civil parishes in Co. Mayo that we know about. You may wish to compare this list (below) with Wikipedia's list of civil parishes in Mayo.

Electoral Divisions

There are 154 electoral divisions in Co. Mayo that we know about.

Townlands

There are 3425 townlands that we know about in Co. Mayo. This represents 100% of all the area in Co. Mayo. You may wish to compare this list (below) with Wikipedia's list of townlands in Mayo.

Subtownlands

There are 71 subtownlands that we know about in Co. Mayo.