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📖About the US Postal Code (ZIP) System

ZIP codes (Zone Improvement Plan) are the postal code system of the United States, administered by the USPS (United States Postal Service). US ZIP codes fall into 4 categories: STANDARD, MILITARY, PO BOX, and UNIQUE (large customers such as schools and institutions).

A ZIP code consists of 5 digits: the first 3 identify the postal region, and the last 2 the specific postal sector. For example, 95050 and 95051 are both in Santa Clara County, California, but cover different areas.

Some codes carry a 4-digit extension (ZIP+4) for more precise delivery targeting.

Special codes include APO (Army Post Office) and FPO (Fleet Post Office), with suffixes such as AA (Armed Forces Americas) and AE (Armed Forces Europe). Military addresses may change with operations or base relocations — check with the relevant military post office for the latest, most accurate information before shipping.

📖United States Postal System

US ZIP codes (Zone Improvement Plan) are administered by USPS. Standard codes have 5 digits: the first 3 identify the postal region and the last 2 the sector; some carry a ZIP+4 extension for finer targeting. Special APO/FPO codes serve military mail.

📖How to Look Up US ZIP Codes Quickly

1. Search directly: enter a ZIP code or an English city name in the search box; click the map link on the right of a result to view the location.

2. If no result is found, browse the state list below to locate ZIP codes by administrative division.

📖Tips

For cross-border e-commerce sellers, always verify the recipient's address and ZIP code before shipping, and check whether the destination is in a remote/outlying postal area — delivery costs can differ dramatically.