United States ZIP Codes

About US ZIP Codes

US ZIP codes are 5-digit postal codes used by the United States Postal Service (USPS) to organize mail delivery.

Types of Zip Codes

Standard ZIP Codes

Used for general residential and business addresses.
Example: 10001 (New York, NY)

PO Box ZIP Codes

Assigned only to post office boxes.
Example: 22313 (Alexandria, VA – PO Box only)

Unique ZIP Codes

For large organizations, universities, or government agencies.
Example: 20500 (The White House, Washington, DC)

Military ZIP Codes

Used by the U.S. military for overseas addresses (APO/FPO).
Example: 09002 (APO, AE – Europe, Middle East)

ZIP Codes by State