Hello Stan
actually there's usually much more information than just country code. At least sites like http://adultfriendsfinder.com/ show my town quite precisely, and my IP is a part of a huge Cablecom pool.
I am actually not fully satified with the quality of those ads.
When I still resided somewhere between Baden and Bremgarten I was recognised as "Otelfingen" (not a real surprise with a Cablecom-connection, right?).
Since I changed to our own VDSL I seem to live in Therwil (BL) according to the ads. That's over two years now. And I do certainly not speak 'Baseldiitsch'.
OTOH I actually do not really care about those personal-ads anyway. ;)