cmarshall - 8:04 pm on Mar 17, 2008 (gmt 0)

Here [geonames.org] is an interesting resource.

If you look at how they break things down, it could be useful. They use a parent/child system of increasing granular specifiers. I'm pretty sure Google Maps does something similar.

I'm working on a similar issue now, but it won't be decided for some time.