27 cities
| City | Rank | 2026 Pop. ↓ | 2020 Pop. | Annual Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Brockton | 1 | 106,892 | 105,485 | 0.52% | 5,011 | 21 | City |
| Plymouth | 2 | 68,589 | 61,022 | 1.42% | 711 | 96 | Town |
| Bridgewater Town | 3 | 29,599 | 26,788 | 0.74% | 1,087 | 27 | City |
| Marshfield | 4 | 26,367 | 25,798 | 0.62% | 920 | 29 | Town |
| Middleborough | 5 | 25,351 | 24,260 | 1% | 367 | 69 | Town |
| Hingham | 6 | 24,690 | 24,260 | 0.56% | 1,112 | 22 | Town |
| Wareham | 7 | 24,206 | 23,274 | 1.42% | 676 | 36 | Town |
| Scituate | 8 | 19,798 | 19,071 | 0.51% | 1,150 | 17 | Town |
| Pembroke | 9 | 18,568 | 18,343 | 0.38% | 852 | 22 | Town |
| Rockland | 10 | 17,818 | 17,774 | 0.31% | 1,777 | 10 | Town |
| Abington | 11 | 17,206 | 17,054 | 0.34% | 1,728 | 10 | Town |
| Duxbury | 12 | 16,653 | 16,075 | 0.84% | 703 | 24 | Town |
| Whitman | 13 | 15,641 | 15,125 | 0.59% | 2,255 | 7 | Town |
| Hanover | 14 | 15,057 | 14,819 | 0.57% | 969 | 16 | Town |
| Kingston | 15 | 14,732 | 13,716 | 0.92% | 790 | 19 | Town |
| East Bridgewater | 16 | 14,645 | 14,429 | 0.43% | 850 | 17 | Town |
| Lakeville | 17 | 12,570 | 11,543 | 1.24% | 425 | 30 | Town |
| Carver | 18 | 11,997 | 11,632 | 0.76% | 322 | 37 | Town |
| Norwell | 19 | 11,713 | 11,339 | 1.02% | 560 | 21 | Town |
| Hanson | 20 | 10,901 | 10,628 | 0.84% | 726 | 15 | Town |
| Hull | 21 | 10,548 | 10,069 | 1.3% | 3,673 | 3 | Town |
| West Bridgewater | 22 | 7,879 | 7,711 | 0.69% | 514 | 15 | Town |
| Halifax | 23 | 7,860 | 7,743 | 0.47% | 492 | 16 | Town |
| Mattapoisett | 24 | 6,933 | 6,511 | 1.24% | 400 | 17 | Town |
| Rochester | 25 | 6,030 | 5,723 | 0.79% | 180 | 34 | Town |
| Marion | 26 | 5,405 | 5,335 | 0.6% | 383 | 14 | Town |
| Plympton | 27 | 3,008 | 2,927 | 0.74% | 205 | 15 | Town |
Brockton is the largest city in Plymouth County, with a population of 106,892.
Plympton is the smallest city in Plymouth County, with a population of 3,008.
There are 27 cities in Plymouth County, Massachusetts.