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

Londonderry is on Logainm.ie: Londonderry.

Area

Londonderry has an area of 2,121.7 km² / 524,283.3 acres / 819.2 square miles.

Londonderry has a total water area of 41,296,168.7 m², which is 1.9% of the total area

Baronies

There are 6 baronies in Co. Londonderry that we know about. You may wish to compare this list (below) with Wikipedia's list of baronies in Londonderry.

Civil Parishes

There are 47 civil parishes in Co. Londonderry that we know about. You may wish to compare this list (below) with Wikipedia's list of civil parishes in Londonderry.

Electoral Divisions

There are 81 electoral divisions in Co. Londonderry that we know about.

Townlands

There are 1255 townlands that we know about in Co. Londonderry. This represents 100% of all the area in Co. Londonderry. You may wish to compare this list (below) with Wikipedia's list of townlands in Londonderry.

Subtownlands

There are 290 subtownlands that we know about in Co. Londonderry.

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Londonderry was added to OpenStreetMap on 9 Jan 2012 by mackerski.

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Debug overlaps and coverage

How long will it take OSM to finish Londonderry?