Identifiers: city · CDP
| Rank | Community | Population |
|---|---|---|
| 1 | Barnstable Town (city), MA | 48,916 |
| 2 | South Yarmouth (CDP), MA | 11,703 |
| 3 | East Falmouth (CDP), MA | 6,278 |
| 4 | West Yarmouth (CDP), MA | 6,278 |
| 5 | Yarmouth Port (CDP), MA | 5,403 |
| 6 | East Harwich (CDP), MA | 5,250 |
| 7 | Northwest Harwich (CDP), MA | 4,296 |
| 8 | Buzzards Bay (CDP), MA | 4,279 |
| 9 | Forestdale (CDP), MA | 4,116 |
| 10 | South Dennis (CDP), MA | 3,899 |
| 11 | Sagamore (CDP), MA | 3,851 |
| 12 | Falmouth (CDP), MA | 3,818 |
| 13 | East Sandwich (CDP), MA | 3,669 |
| 14 | Dennis Port (CDP), MA | 3,487 |
| 15 | Sandwich (CDP), MA | 2,998 |
| 16 | East Dennis (CDP), MA | 2,585 |
| 17 | West Dennis (CDP), MA | 2,304 |
| 18 | Brewster (CDP), MA | 2,028 |
| 19 | Harwich Center (CDP), MA | 1,995 |
| 20 | Harwich Port (CDP), MA | 1,899 |