URLs listed in this category:
Lookup Directory
Lists lookups for people searches, ZIP and area codes, phone numbers and emails, U.S. and Canadian addresses.
http://www.melissadata.com/lookups/
USPS - ZIP Code Lookup
Look up a ZIP code.
http://zip4.usps.com/zip4/
Zip Code Database List
ZIP code database list & demographics. Free ZIP code finder. Download the data - maps, zip codes, area codes, household income, population, postal codes, MSA codes, CBSA codes, etc. Zip code by MSA.
http://www.zip-codes.com/
Zip Code, Area Code
Everything about zip codes on one web page. Zip Code maps and cross reference between zip, city, state, population and area code.
http://zip.langenberg.com/
