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Usps: Zip Code Lookup
This search provided by the United States Postal Service will help you determine what zip code is associated with what city and vice versa.
National Council of Teachers of Mathematics
Nctm: Figure This: Bar Codes
An exploration of the binary system using U.S. postal zip codes. Discover what numbers the long and short bars in a zip code represent in this one page activity from the NCTM Math Challenges for Families collection.