first zip code

ZIP Code – Wikipedia


What was the first zip code in the United States –

A ZIP code specifies a town, or sometimes 2 or more towns served by a single post office. There no ZIP codes fo counties, states, or countries.

If any, what was the first ZIP code ever designated, and

In 1963 America adopted the postal code, but named it Zone Improvement Plan code or ZIP code for short. The Zip code is used in all 50 states as well as the American territories. Since the zoning was implemented at the same time the first ZIP code would be the one with the lowest number and that would be 00601 which is for Adjuntas, Puerto Rico.

ZIP Code™ Lookup | USPS

Cities by ZIP Code™ For more rapid delivery, please use the recommended or recognized city names whenever possible for this ZIP Code ™.

Los Angeles County – California Zip Code Boundary Map (CA)

This page shows a Google Map with an overlay of Zip Codes for Los Angeles County in the state of California. Users can easily view the boundaries of each Zip Code and the state as a whole.

USPS – Find a ZIP Code

A ZIP Code is an essential part of the mailing process. We provide your business with several different ways to find a ZIP Code and understand it.


The ZIP Code began as scheduled. At first, use of the new code was not mandatory for anyone, but in 1967, the Department required mailers of second- and third-class bulk mail to presort by ZIP Code. The public and business mailers alike adapted well to its use.

All Zip Codes in Los Angeles CA Products. ZIP Code Database Get all US ZIP Codes and their information in one easy to use database. ZIP+4 ZIP Code Database Covering …

Free ZIP code map, zip code lookup, and zip code list

The first digit of a USA ZIP code generally represents a group of U.S. states. The map of the first digit of zip codes above shows they are assigned in order from the north east to the west coast. The first 3 digits of a ZIP code determine the central mail processing facility, also called sectional center facility or “sec center”, that is used to process and sort mail.