Nearest Zip Code Search using asp.net

Question

I want to inplement functionallity that will search zip codes, if user enter any zip code than all the zip codes close to entered zip code will be shown. Please let us know

Answer 1

I work in the address verification field, where we have some experience doing this) where "ZIP codes" and "geocoding" are buzz-words. For further location accuracy, you will want to consider verifying a complete address and adding the ZIP+4 code. This will provide more relevant results to your user.

Generally, free services won't provide that kind of value, but there are some affordable options that are officially licensed, or certified, by the USPS, to distribute that data. One such service is LiveAddress (a service I've worked on myself). The ZIP+4 code is more accurate than a generic ZIP code, so you'll get more accurate geolocated results.