New answers tagged county
The GADM boundaries are pretty good, however you'd probably want to review them on a country-by-country basis. GADM is agnostic about what the administrative units are called, just referring to them as administrative levels one through N. If your goal is to get roughly 2,500 km^2 units, just divide each country's total area by counts at the different ...
For Germany, Austria and Switzerland and other European countries, you can find the data from the Eurostat (different levels of NUTS). Those are the "official ones". You have 1 294 entities at level 3.
You best bet is: http://www.naturalearthdata.com/ Has administrative area shapefiles.
http://www.gadm.org/home has one for whole world in vector format. You download data in several formats. Shp file format may have some problems with column length and local names. But if you use english names that doesnt show up
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