USPS & US Census Bureau Verified
United States ZIP Code & Postal Directory (2026)
Explore official 5-digit United States ZIP codes organized by state, metropolitan area, and neighborhood. Grounded in authoritative USPS postal geographic boundaries and US Census Bureau demographic metrics.
Verified Sources: USPS ZIP Code Directory & US Census Bureau (ACS 5-Year)
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Audited: September 2026
Browse by State
Active US StatesHow the United States ZIP Code System Works
Introduced in 1963 by the United States Postal Service (USPS), ZIP stands for Zone Improvement Plan. The 5-digit numerical code identifies the geographic destination area for rapid automated mail sorting and parcel delivery.
Anatomy of a 5-Digit US Postal Code:
Digit 1 National Zone (e.g. 7 covers TX, LA, AR, OK)
Digits 2 – 3 Sectional Center Facility (SCF) region (e.g. 87 for Austin)
Digits 4 – 5 Specific Delivery Area / Local Post Office (e.g. 01 for Downtown)