| City | Rank | 2026 Pop. ↓ | 2020 Pop. | Annual Change | Density (/mi²) | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Springfield | 1 | 155,014 | 155,182 | 0.2% | 4,864 | 32 | City |
| Chicopee | 2 | 55,329 | 55,456 | 0.03% | 2,415 | 23 | City |
| Westfield | 3 | 40,640 | 40,153 | 0.23% | 878 | 46 | City |
| Holyoke | 4 | 38,018 | 38,142 | -0.01% | 1,796 | 21 | City |
| Agawam Town | 5 | 28,852 | 28,626 | 0.24% | 1,237 | 23 | City |
| West Springfield Town | 6 | 28,834 | 28,766 | 0.02% | 1,723 | 17 | City |
| Ludlow | 7 | 21,467 | 20,764 | 0.88% | 789 | 27 | Town |
| East Longmeadow | 8 | 16,621 | 16,452 | 0.24% | 1,285 | 13 | Town |
| Longmeadow | 9 | 15,688 | 15,821 | 0% | 1,726 | 9 | Town |
| Wilbraham | 10 | 14,791 | 14,562 | 0.52% | 671 | 22 | Town |
| Palmer Town | 11 | 12,373 | 12,418 | 0.05% | 392 | 32 | City |
| Southwick | 12 | 9,346 | 9,214 | 0.44% | 303 | 31 | Town |
| Monson | 13 | 8,202 | 8,136 | 0.33% | 185 | 44 | Town |
| Hampden | 14 | 4,967 | 4,954 | 0.14% | 253 | 20 | Town |
| Brimfield | 15 | 3,750 | 3,689 | 0.29% | 108 | 35 | Town |
| Holland | 16 | 2,576 | 2,596 | -0.04% | 210 | 12 | Town |
| Wales | 17 | 1,838 | 1,828 | 0.27% | 117 | 16 | Town |
| Russell | 18 | 1,640 | 1,638 | 0.18% | 94 | 17 | Town |
| Granville | 19 | 1,546 | 1,533 | 0.32% | 37 | 42 | Town |
| Chester | 20 | 1,225 | 1,225 | 0.25% | 33 | 37 | Town |
| Blandford | 21 | 1,214 | 1,213 | 0.17% | 24 | 52 | Town |
| Montgomery | 22 | 848 | 814 | 1.19% | 57 | 15 | Town |
| Tolland | 23 | 479 | 469 | 0.63% | 15 | 32 | Town |
Springfield is the largest city in Hampden County, with a population of 155,014.
Tolland is the smallest city in Hampden County, with a population of 479.
There are 23 cities in Hampden County, Massachusetts.