Based on data in OpenStreetMap, here is a list of townlands in Co. Donegal. (Debug overlaps and coverage)
Donegal has an area of 4,859.4 km² / 1,200,774.2 acres / 1,876.2 square miles
Donegal has a total water area of 209,860,351.6 m², which is 4.3% of the total area
There are 0 baronies in Co Donegal that we know about.
Wikipedia's list of baronies in Donegal.
There is 1 civil parish in Co Donegal that we know about.
Wikipedia's list of civil parishes in Donegal.
There are 10 townlands that we know about in Co. Donegal. This represents 0.33% of all the area in Co. Donegal.
Wikipedia's list of townlands in Donegal.
610 A, 3 R, 39 P
1781 A, 1 R, 22 P
20 A, 1 R, 33 P
325 A, 0 R, 4 P
84 A, 0 R, 38 P
Clonca Civil Parish,
182 A, 2 R, 22 P
364 A, 0 R, 26 P
228 A, 2 R, 9 P
64 A, 0 R, 12 P
116 A, 1 R, 14 P
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Debug overlaps and coverage
How long will it take OSM to finish Donegal?