Overview
This data set provides the IANA time zone for each US Postal Service ZIP Code. It covers the entire United States and its territories. Updated monthly.
Last updated March 19, 2025. The record count is 38,932.
Dataset
This data is provided in 4 formats: CSV, JSON, XML, and SQLite.
All formats provide these 3 data points:
- ZipCode: 5-digit ZIP Code
- TimeZone: The official IANA time zone name. Possible values:
- America/Adak
- America/Anchorage
- America/Boise
- America/Chicago
- America/Denver
- America/Detroit
- America/Indiana/Indianapolis
- America/Indiana/Knox
- America/Indiana/Marengo
- America/Indiana/Petersburg
- America/Indiana/Tell_City
- America/Indiana/Vevay
- America/Indiana/Vincennes
- America/Indiana/Winamac
- America/Juneau
- America/Kentucky/Louisville
- America/Kentucky/Monticello
- America/Los_Angeles
- America/Menominee
- America/Metlakatla
- America/New_York
- America/Nome
- America/North_Dakota/Beulah
- America/North_Dakota/Center
- America/North_Dakota/New_Salem
- America/Phoenix
- America/Puerto_Rico
- America/Sitka
- America/St_Thomas
- America/Yakutat
- Pacific/Chuuk
- Pacific/Guam
- Pacific/Honolulu
- Pacific/Kosrae
- Pacific/Kwajalein
- Pacific/Majuro
- Pacific/Pago_Pago
- Pacific/Palau
- Pacific/Pohnpei
- Pacific/Saipan
- Pacific/Wake
- ObservesDST: whether the area observes Daylight Saving Time. Possible values:
- true
- false
Excluded ZIP Codes
Excludes APO, DPO, FPO, and unique (single-entity) ZIP codes because they are non-geographic.