I know this question sounds like a repeat of few questions here, but none of those questions answered what i wanted. I am interested in knowing if someone know how to find other
Here is a simple function to call - http://www.zipcodeapi.com/API#radius. The call looks like: http://www.zipcodeapi.com/rest//radius.///.
This ZipcodeAPI service is free up to 50 requests per hour and only $250 a year for 5,000 requests per hour.