US ZIP Code Map
Search locations, drop markers, and compare ZIP codes from OSM and Census data. Scan the map to visualize official ZCTA boundaries.
Understanding ZIP Codes
A ZIP code is a system used by the US Postal Service since 1963 to route mail. While we often think of them as regions on a map, they are technically delivery routes.
ZIP Code vs. ZCTA
You might see the term ZCTA here. This stands for ZIP Code Tabulation Area.
- ZIP codes are for mail delivery by USPS.
- ZCTAs are map areas created by the Census Bureau to approximate ZIP codes.
They usually match, but not always perfectly.
How to Use This Tool
- Search a location — Find any address or city in the US.
- Scan the map — Click the scan button to see ZIP code boundaries. If the button is disabled, please zoom in closer to your target area—we limit this to ensure data loads quickly and correctly.
- Check the details — Click anywhere on the map to see the ZIP code from two different sources (OpenStreetMap and Census Bureau).
- Compare results — If the ZIP code matches from both sources, it is highly likely to be correct.
Limitations
Please note that this tool relies on public data (OpenStreetMap and US Census Bureau). While usually accurate, it may not perfectly reflect the latest official USPS delivery routes.
- Rural areas: Some places might not have a clear ZIP boundary.
- PO Boxes: These don't have a geographic area on the map.
- Updates: USPS boundaries change, and map data might take time to catch up.
For critical mail delivery, always verify with the official USPS lookup.
Frequently Asked Questions
Why do some areas show no ZIP code?
Some rural or unpopulated areas may not have an assigned ZIP code boundary. Also, ZIP codes for PO Boxes or military units don't cover a physical land area.
Why are there two different ZIP codes? We show data from both OpenStreetMap (community data) and the Census Bureau (government data). If they differ, it usually means the boundary is complex or has changed recently. If they match, the information is very likely correct.
What do the colors mean?
The colors are just there to help you distinguish different ZIP code areas on the map. They don't have a specific meaning.