Washington County, Pennsylvania Zip Codes
| Washington | 50,183 |
| Canonsburg | 43,435 |
| McDonald | 17,440 |
| Monongahela | 10,543 |
| Charleroi | 10,248 |
| Venetia | 9,500 |
| Finleyville | 8,604 |
| Brownsville | 7,886 |
| Burgettstown | 6,699 |
| Eighty Four | 5,539 |
| Houston | 5,138 |
| Donora | 4,622 |
| Avella | 3,972 |
| Claysville | 3,829 |
| California | 3,796 |
| Bentleyville | 3,528 |
| New Eagle | 2,285 |
| Cecil | 1,949 |
| Coal Center | 1,889 |
| Scenery Hill | 1,710 |
| Bulger | 1,552 |
| Fredericktown | 1,543 |
| West Alexander | 1,508 |
| Prosperity | 1,490 |
| Marianna | 1,343 |
| Hickory | 1,293 |
| Lawrence | 1,146 |
| Richeyville | 1,111 |
| Amity | 1,033 |
| Daisytown | 918 |
| Midway | 906 |
| Roscoe | 831 |
| Cokeburg | 767 |
| Ellsworth | 721 |
| West Finley | 669 |
| Strabane | 566 |
| Muse | 521 |
| Slovan | 516 |
| Van Voorhis | 504 |
| Langeloth | 447 |
| Denbo | 444 |
| Beallsville | 422 |
| Vestaburg | 419 |
| Dunlevy | 366 |
| Atlasburg | 316 |
| Elco | 272 |
| Stockdale | 253 |
| Elrama | 248 |
| Allenport | 210 |
| Taylorstown | 200 |
| Southview | 123 |
| Meadow Lands | 102 |
| West Middletown | 71 |
| Joffre | 70 |
| Millsboro | 69 |
| Westland | 0 |
- Population is the most recent figure from the U.S. Census Bureau's 2022 American Community Survey (ACS) 5-Year Estimates.