Finding geographical areas around a city name or zip code

(to be done in VFP9SP2 existing app)

Customer need: to grab/query towns near a certain zip code or city name, akin to like when you use an app where you're looking for a car and say "show me matches within 50 miles." I'm thinking latitude/longitude and google somehow, but I thought I'd poll the community to see what you'd recommend.

Thanks! --Mike