Time zones
ZIP Codes by Time Zone
14,963 of the 33,774 residential ZIP codes keep Eastern time, the most of any U.S. time zone. Parts of Indiana, Kentucky, Michigan, North Dakota and Alaska keep local IANA zones of their own; each ZIP code's page names its zone.
- Eastern time14,963
- Central time12,639
- Pacific time3,086
- Mountain time2,226
- Mountain time (no daylight saving)386
- Alaska time243
- Atlantic time132
- Hawaii-Aleutian time99
Eastern time
14,963 residential ZIP codes in 24 states, kept by 11 IANA zones.
| IANA zone | States (residential ZIP codes) | ZIP codes |
|---|---|---|
| America/New_York | Pennsylvania (1,833), New York (1,818), Ohio (1,233), Florida (930), Virginia (903), North Carolina (853), Georgia (751), West Virginia (738), New Jersey (598), Kentucky (558), Massachusetts (539), Maryland (477), Maine (426), South Carolina (424), Connecticut (288), Vermont (265), New Hampshire (247), Tennessee (209), Rhode Island (81), Delaware (68), District of Columbia (57), Indiana (9), Alabama (1) | 13,306 |
| America/Detroit | Michigan (955), Indiana (4) | 959 |
| America/Indiana/Indianapolis | Indiana (599) | 599 |
| America/Kentucky/Louisville | Indiana (26), Kentucky (7) | 33 |
| America/Indiana/Vincennes | Indiana (32) | 32 |
| America/Toronto | New York (8), Michigan (1) | 9 |
| America/Indiana/Marengo | Indiana (8) | 8 |
| America/Indiana/Petersburg | Indiana (6) | 6 |
| America/Indiana/Winamac | Indiana (5) | 5 |
| America/Indiana/Vevay | Indiana (4) | 4 |
| America/Kentucky/Monticello | Kentucky (2) | 2 |
Source: time zones from simplemaps US ZIP Codes (CC BY 4.0), else the nearest ZIP code's; Census 2020 ZCTAs.
Central time
12,639 residential ZIP codes in 20 states, kept by 9 IANA zones.
| IANA zone | States (residential ZIP codes) | ZIP codes |
|---|---|---|
| America/Chicago | Texas (1,955), Illinois (1,396), Missouri (1,035), Iowa (970), Minnesota (879), Wisconsin (781), Kansas (694), Oklahoma (664), Alabama (655), Arkansas (615), Louisiana (539), Nebraska (519), Tennessee (427), Mississippi (427), North Dakota (339), South Dakota (279), Kentucky (213), Indiana (98), Florida (83) | 12,568 |
| America/Menominee | Michigan (36), Wisconsin (2) | 38 |
| America/Indiana/Tell_City | Indiana (9) | 9 |
| America/North_Dakota/New_Salem | North Dakota (8) | 8 |
| America/Indiana/Knox | Indiana (7) | 7 |
| America/North_Dakota/Beulah | North Dakota (5) | 5 |
| America/Winnipeg | Minnesota (2) | 2 |
| America/North_Dakota/Center | North Dakota (1) | 1 |
| America/Ojinaga | Texas (1) | 1 |
Source: time zones from simplemaps US ZIP Codes (CC BY 4.0), else the nearest ZIP code's; Census 2020 ZCTAs.
Pacific time
3,086 residential ZIP codes in 6 states, kept by 1 IANA zone.
| IANA zone | States (residential ZIP codes) | ZIP codes |
|---|---|---|
| America/Los_Angeles | California (1,801), Washington (605), Oregon (415), Nevada (181), Idaho (83), Arizona (1) | 3,086 |
Source: time zones from simplemaps US ZIP Codes (CC BY 4.0), else the nearest ZIP code's; Census 2020 ZCTAs.
Mountain time
2,226 residential ZIP codes in 13 states, kept by 2 IANA zones.
| IANA zone | States (residential ZIP codes) | ZIP codes |
|---|---|---|
| America/Denver | Colorado (527), New Mexico (371), Montana (369), Utah (298), Wyoming (177), South Dakota (96), Nebraska (67), North Dakota (35), Texas (34), Arizona (31), Kansas (10), Idaho (1) | 2,016 |
| America/Boise | Idaho (195), Oregon (13), Wyoming (2) | 210 |
Source: time zones from simplemaps US ZIP Codes (CC BY 4.0), else the nearest ZIP code's; Census 2020 ZCTAs.
Mountain time (no daylight saving)
386 residential ZIP codes in 2 states, kept by 1 IANA zone.
| IANA zone | States (residential ZIP codes) | ZIP codes |
|---|---|---|
| America/Phoenix | Arizona (385), California (1) | 386 |
Source: time zones from simplemaps US ZIP Codes (CC BY 4.0), else the nearest ZIP code's; Census 2020 ZCTAs.
Alaska time
243 residential ZIP codes in 1 state, kept by 6 IANA zones.
Source: time zones from simplemaps US ZIP Codes (CC BY 4.0), else the nearest ZIP code's; Census 2020 ZCTAs.
Atlantic time
132 residential ZIP codes in 1 state, kept by 1 IANA zone.
| IANA zone | States (residential ZIP codes) | ZIP codes |
|---|---|---|
| America/Puerto_Rico | Puerto Rico (132) | 132 |
Source: time zones from simplemaps US ZIP Codes (CC BY 4.0), else the nearest ZIP code's; Census 2020 ZCTAs.
Hawaii-Aleutian time
99 residential ZIP codes in 2 states, kept by 2 IANA zones.
Source: time zones from simplemaps US ZIP Codes (CC BY 4.0), else the nearest ZIP code's; Census 2020 ZCTAs.