Free API for analyzing American mailing addresses?

Question

I would like to use the API to parse US Postal addresses entered into an ASP.NET application. I will store the input address no matter how it is entered, then try to parse and verify with the user.

Do Google, Microsoft, or Yahoo have such features in their APIs? If so, what is your experience with the various APIs?

Answer 1

USPS provides its API if everything is inside the US. You will need to apply for access to the API. Start here:

https://www.usps.com/business/webtools-address-information.htm ?

Answer 2

Geonames

http://www.geonames.org/export/web-services.html#postalCodeLookupJSON

Answer 3

, ,

http://www.webservicex.net/uszip.asmx

http://codebump.com/services/zipcodelookup.asmx

In addition, a lot of google apis (maps, new) will turn zip codes into cities and other information (news, geo-coordinates, etc.).