City by ZIP code
Look up the city, state and county for a five-digit US ZIP or ZIP+4. Preserve leading zeros and inspect sourced map references.
A traceable reference snapshot
This snapshot contains 40977 records and 29540 state/city pairs across 50 states and DC, excluding territories and military mail. GeoNames provides the reference under CC BY 4.0; it is not a complete USPS register or delivery verification.
Preserve leading zeros and place relationships
ZIP codes remain strings. ZIP+4 searches use the first five digits, not the delivery-unit extension. Distinguish cities by their state or browse an entire state. Import the CSV zip column as text in spreadsheets; JSON preserves strings directly.
Map and synthetic-address limits
The map shows approximate GeoNames place coordinates, not a building or ZIP boundary. The source supplies no timezone, so none is inferred. Generate a test address to combine the selected city/state/ZIP reference with a synthetic street and profile from the fakeloc engine. This does not identify a resident or verify delivery.
Reproduce and share
Random mode samples distinct ZIP codes within the selected state. If requested quantity exceeds coverage, all available records are returned. The same version, filters and seed reproduce the result. Shared links carry conditions; data loads in the browser. Exports include source and version.