ZIP code tools
Where am I?
Each of these asks your browser for your location once, finds the ZIP code area you are standing in, and answers from it. Without a location, type a ZIP code, town or address instead. Your location is not stored.
What ZIP code am I in?
The ZIP code you are standing in, from your phone's or computer's location, drawn on its boundary map.
What county am I in?
Your county from your location, or from a ZIP code, town or address, and when your ZIP code area straddles a county line, the share of each.
What area code am I in?
The area codes for where you are, overlays included, from the telephone exchanges of your town.
What time zone am I in?
Your time zone, its abbreviation and UTC offset, the local time, and whether your device's clock agrees.
Lists, distances and maps
ZIP codes within a radius
Every ZIP code within N miles of a ZIP code or address, sorted by real distance, with a CSV export.
Distance between two ZIP codes
Straight-line miles and kilometres, with both answer cards side by side.
Bulk ZIP code lookup
Paste a column of ZIP codes, get city, county, FIPS, time zone and coordinates back. Runs in your browser; your list is never uploaded.
ZIP code for an address
A street address to its ZIP code, through the Census geocoder.
ZIP codes in a county, city or metro
Pick an area, copy the list or download it.
ZIP code map
Every ZIP code boundary in the US on one map; click an area to open its page.
For whole datasets, the free ZIP code database (CSV, JSON and SQLite) and the REST API carry the same facts.