For fastest service, use the exact zip code for the destination address. The zip codes in this table will bring mail to the main post office in each city, which is faster than no zip code at all.
This table can also be used to send a batch of letters to a central zip code by Express Mail. The local postmaster will then deliver the individual letters locally, saving time and money.
To obtain a zip code for any location, call the U.S. Postal Service at (202) 682-9595 from 8:00 A.M. to 8 00 P.M., Monday through Friday and 8 00 A.M. to 5:00 P.M. on Saturday. After hours, call the Honolulu Post Office at (808) 423-3930.
Main Post Office zip codes
| City | Zip Code |
| Atlanta | 30301 |
| Baltimore | 21233 |
| Boston | 02101 |
| Chicago | 60601 |
| Cincinnati | 45202 |
| Cleveland | 44101 |
| Columbus | 43216 |
| Dallas | 75201 |
| Denver | 80201 |
| Detroit | 48231 |
| Houston | 77052 |
| Indianapolis | 46206 |
| Los Angeles | 90086 |
| Miami | 33101 |
| Milwaukee | 53201 |
| Minneapolis | 55401 |
| New York | 10001 |
| Norfolk | 23503 |
| Philadelphia | 19104 |
| Phoenix | 85201 |
| Pittsburgh | 15233 |
| Portland | 97208 |
| Sacramento | 95814 |
| St. Louis | 63166 |
| San Antonio | 78265 |
| San Diego | 92183 |
| San Francisco | 94142 |
| Seattle | 98101 |
| Tampa | 33602 |
| Washington, DC (federal) | 20500 |
| Washington, DC (other) | 20090 |