Which geo service (if any) can return lat-long of the city center and the city radius given the name of a city?

Question

I am looking for a concrete example (http://stackoverflow.com/questions/1313607/finding-the-center-point-of-a-city, for instance, contains general information, which does not advance me much)

Answer 1

This was recently discussed over at GIS.SE. Take a look at Maxmind Free World Cities Database and geonames, among others noted in the questions linked below.

• Comprehensive list of Latitude and Longitude values of cities round the world
• Is a Country/State/City Database available?