18 zips
| Zip Code | City | Population ↓ |
|---|---|---|
| 21740 | Hagerstown | 63,140 |
| 21742 | Hagerstown | 35,114 |
| 21713 | Boonsboro | 10,146 |
| 21795 | Williamsport | 9,942 |
| 21783 | Smithsburg | 9,881 |
| 21722 | Clear Spring | 6,918 |
| 21782 | Sharpsburg | 4,056 |
| 21750 | Hancock | 3,585 |
| 21756 | Keedysville | 3,172 |
| 21746 | Hagerstown | 2,416 |
| 21779 | Rohrersville | 1,449 |
| 21733 | Fairplay | 1,240 |
| 21719 | Cascade | 1,162 |
| 21767 | Maugansville | 914 |
| 21734 | Funkstown | 826 |
| 21711 | Big Pool | 789 |
| 21781 | Saint James | 34 |
| 21715 | Brownsville | 18 |
The data shown reflect ZCTAs from the US Census. As of 2024, there are 18 ZCTAs in Washington County, Maryland (US Census).