The SmartyStreets US Street Address API is an easy to use system to access all of the data of the US Postal service, in a far simpler format. Simply send an HTTP request, get a JSON response. 100% uptime, fully documented, fanatical customer support. The API returns name, street, street suffix, city, sate, zipcode, delivery point, plus meta data such as zip type, county name, congressional district, geolocation, time zone, and more.
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So far, we don't have a record of any changes to this API