Zip Code | City | Population |
|---|---|---|
| 21550 | Oakland | 13,640 |
| 21536 | Grantsville | 3,945 |
| 21562 | Westernport | 3,248 |
| 21561 | Swanton | 2,517 |
| 21539 | Lonaconing | 2,095 |
| 21520 | Accident | 2,056 |
| 21531 | Friendsville | 2,014 |
| 21541 | McHenry | 1,682 |
| 21521 | Barton | 1,426 |
| 21538 | Kitzmiller | 571 |
| 21523 | Bloomington | 133 |