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I've been using the zipcode information from here:
http://www.census.gov/geo/maps-data/data/gazetteer2010.html
in my mySQL database but I've noticed that it's missing quite a few zipcodes
(ex. 94142, San Francisco, CA)
....does anyone know of some more up to date zip code data?
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Over 1,000 ZIP codes have been decomissioned as post offices close or the needs of the United States Postal Service change.
The USPS updates their zip codes quarterly.
The term ZIP Code was originally registered as a service mark by the USPS; its registration expired in 1997.
Due to an increase in population or to the improve postal operations, the US Postal Service® will occasionally add a new ZIP Code or change ZIP Code boundaries.
Try the data at http://www.geonames.org/
(There's a Free postal Code Data link there, with postal codes for lots of countries).
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The United States Postal Service is the government entity that provisions ZIP codes. As such, the authoritative, always-correct database is theirs.
Happily, they provide free APIs that developers can use:
https://www.usps.com/business/web-tools-apis/welcome.htm
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