I'm wondering if there is a way to enact/implement or write a sort of "Geographic Lookup" feature of Accounts, Contacts & Leads alike?  What we are hoping to accomplish: Our organization spends a lot of time traveling throughout the US mainly, but also the world.  We are looking for a search that a future traveling employee can say "I'll be in Nashville next week, run a search to see who we have in our system within [XX]-Miles that I could take to dinner"

Any and all advice would be greatly appreciated, some sort of a radius search would be the most effective.  I'm sure you could do some sort of zip code search however if you're in the middle of LA where they have dozens of zip codes you would spend half your time looking those up.  Thanks for your time.