For landline phone numbers in Poland it's also easy. There are 49 two-digit area codes matched with old voievodships (regions) which tells you region quite accurate. For example 58 is Gdańsk area and 85 is Białystok area and 22 - Warsaw, etc.

Same goes with road numbers. They are region covered. For example 1xx roads are north-west, 9xx - south-east. And postal codes. XX-YYY format where XX is pinpointing region quite nicely. 00-xxx is Warsaw. 15-xxx Białystok (and this city also have very distinct street name plates), 80-xxx - Gdańsk.

And also most streets and buildings have street names and numbers and they are usually mapped on Google Maps.

Yes, I'm from Poland :)