U.S. ZIP Code Directory
Search any U.S. ZIP code to view city, county, demographics, and a map. 39,000+ ZIP codes covered.
Tip: go directly to /zip/90210/
Most populated ZIP codes by state
The largest ZIP code (by resident population) in each of these states — 2020 Census.
What’s on each ZIP page
Standardized layout for consistent indexing.
- Primary city, county, and state
- ZIP type (Standard / PO Box / Unique)
- Population, income, and key demographics (Standard ZIPs)
- Map preview and nearby ZIP codes
Browse ZIP codes by state
Start broad, then drill into a state’s cities and ZIP codes.
ZIP code lookup for the United States
ZIP codes (Zone Improvement Plan) are used by USPS to improve mail routing and logistics. On ZipCityLookup, each ZIP code has a dedicated page with standardized fields so you can quickly identify the associated city, state, and county, and navigate to related geographic pages.
How to use this directory
- Type a 5-digit ZIP code in the search box above and submit.
- Or open a ZIP page directly (example: /zip/90210/).
- Prefer browsing? Start from states and drill into cities and ZIP codes.
About data and accuracy
ZIP code boundaries and “primary city” labels can vary by dataset and can change over time. If you notice a mismatch, treat the ZIP page as a general reference and validate critical use cases with official sources.
FAQ
What is the URL format for ZIP pages?
/zip/#####/.