State Abbreviations and FIPS Codes used in the U.S.

Below are State Abbreviations (for example, “DE” for DELAWARE state or “MO” for MISSOURI) and FIPS Codes (Federal Information Processing Standards) used in the U.S. to send an error-free letter and package:

State Abbreviations and FIPS Codes

Particularity

Note: Some new business addresses may now have an additional number following the standard 5-digit zip code number. These numbers should be used in all correspondence.

Examples:

• Iowa State University
• Ames, I0 50011

or

• University of Kansas
• Lawrence, KS 66045-2140

or

• Michigan State University
• East Lansing, MI 48824-1035

The Establishment of the U.S. State Abbreviation System

The USPS established the system of U.S. state abbreviations in 1963 to modernize the postal service. This reform notably introduced the ZIP code, a five-digit postal code that further specified delivery areas. The standardized state abbreviations, combined with the ZIP code, improved the efficiency and accuracy of mail distribution in the United States.

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