Understanding ZIP Codes
The ZIP Code system was introduced in 1963 by the United States Postal Service (USPS) to organize and speed up mail delivery. Each ZIP code corresponds to a specific geographic region, covering cities, neighborhoods, or rural areas.
What You Can Do on zip-code.us
ZIP Code Search
Enter any ZIP code to see the city, state, and county it belongs to.
City & State Lookup
Browse ZIP codes by state or search by city to get full postal information.
ZIP Code Maps
Visualize coverage areas with interactive maps that show ZIP code boundaries.
Why ZIP Codes Matter
- Accurate Mail Delivery: Ensures USPS can deliver mail on time.
- Regional Identity: Helps identify cities, towns, and counties.
- Business & Marketing: Companies use ZIP codes for logistics, delivery, and customer targeting.
- Data & Research: ZIP code data is widely used for demographics and geographic analysis.