FREE TOOL

Time zone by ZIP code

Enter a ZIP code, get its time zone and the local time there right now.

Free, no signup.

THE API UNDERNEATH

GET /postal/33139?country=US

The timezone ships on every ZIP lookup, so this page is one /postal call from your browser. Same endpoint on every plan, one pooled request per lookup.

ZIP code APITimezone APICounty by ZIP

QUESTIONS

Does it handle daylight saving?
Yes. The answer is the IANA timezone for the ZIP, and the clock shown follows its current daylight rules automatically.
Can one ZIP span two time zones?
A handful sit on a boundary. The answer is the zone at the ZIP's center point, which is right for nearly every address in it.
Can I do this from code?
Yes. The timezone ships on every GET /postal lookup along with city, state, county, and coordinates. One pooled request.
What about coordinates instead of a ZIP?
The timezone endpoint takes lat and lon directly and answers the zone at that exact point.