About US ZIP Codes
ZIP codes (Zone Improvement Plan codes) were introduced by the United States Postal Service (USPS) in 1963 to improve mail sorting and delivery efficiency. Each ZIP code identifies a specific geographic area for mail delivery. The US has 33,782 ZIP codes spread across 50 states, Washington D.C., and 5 territories covering 1,913 counties. Browse by state below to find detailed information for any ZIP code including city, county, population, timezone, and location.
Browse ZIP Codes by State
US Territories & DC
All States — ZIP Code Count
| State | Abbreviation | ZIP Codes |
|---|---|---|
| Alabama | AL | 656 |
| Alaska | AK | 245 |
| Arizona | AZ | 417 |
| Arkansas | AR | 615 |
| California | CA | 1,802 |
| Colorado | CO | 527 |
| Connecticut | CT | 288 |
| Delaware | DE | 68 |
| Florida | FL | 1,011 |
| Georgia | GA | 750 |
| Hawaii | HI | 97 |
| Idaho | ID | 279 |
| Illinois | IL | 1,396 |
| Indiana | IN | 807 |
| Iowa | IA | 970 |
| Kansas | KS | 704 |
| Kentucky | KY | 780 |
| Louisiana | LA | 539 |
| Maine | ME | 426 |
| Maryland | MD | 477 |
| Massachusetts | MA | 539 |
| Michigan | MI | 992 |
| Minnesota | MN | 881 |
| Mississippi | MS | 427 |
| Missouri | MO | 1,035 |
| Montana | MT | 369 |
| Nebraska | NE | 586 |
| Nevada | NV | 179 |
| New Hampshire | NH | 247 |
| New Jersey | NJ | 598 |
| New Mexico | NM | 371 |
| New York | NY | 1,826 |
| North Carolina | NC | 853 |
| North Dakota | ND | 388 |
| Ohio | OH | 1,232 |
| Oklahoma | OK | 664 |
| Oregon | OR | 427 |
| Pennsylvania | PA | 1,832 |
| Rhode Island | RI | 81 |
| South Carolina | SC | 424 |
| South Dakota | SD | 375 |
| Tennessee | TN | 636 |
| Texas | TX | 1,990 |
| Utah | UT | 298 |
| Vermont | VT | 265 |
| Virginia | VA | 903 |
| Washington | WA | 605 |
| West Virginia | WV | 738 |
| Wisconsin | WI | 783 |
| Wyoming | WY | 179 |
Frequently Asked Questions
How many ZIP codes are there in the United States?
There are over 40,000 ZIP codes in the United States. This directory covers 33,782 standard residential ZIP codes across 56 states and territories, spanning 1,913 counties.
What does ZIP code stand for?
ZIP stands for Zone Improvement Plan. ZIP codes were introduced by the USPS in 1963 to make mail sorting and delivery more efficient across the country.
Which state has the most ZIP codes?
Texas has the most ZIP codes with 1,990 ZIP codes.
How do ZIP codes work?
The first digit of a ZIP code represents a broad geographic region of the US. The next two digits narrow it down to a sectional center facility, and the last two digits identify a specific post office or delivery area.