| City | Rank | 2026 Pop. ↓ | 2020 Pop. | Annual Change | Density (/mi²) | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Hillsdale | 1 | 7,996 | 8,029 | -0.07% | 1,404 | 6 | City |
| Somerset | 2 | 4,622 | 4,593 | 0.35% | 138 | 33 | Township |
| Jerome | 3 | 4,587 | 4,625 | -0.56% | 141 | 33 | Township |
| Jefferson | 4 | 3,043 | 3,016 | 0.2% | 86 | 35 | Township |
| Cambria | 5 | 2,548 | 2,546 | 0.04% | 73 | 35 | Township |
| Adams | 6 | 2,332 | 2,329 | 0.09% | 65 | 36 | Township |
| Jonesville | 7 | 2,173 | 2,182 | -0.09% | 778 | 3 | City |
| Camden | 8 | 2,078 | 2,074 | 0.14% | 49 | 42 | Township |
| Hillsdale | 9 | 2,003 | 2,002 | 0.15% | 159 | 13 | Township |
| Scipio | 10 | 1,858 | 1,839 | 0.16% | 64 | 29 | Township |
| Reading | 11 | 1,737 | 1,730 | 0.17% | 51 | 34 | Township |
| Allen | 12 | 1,616 | 1,601 | 0.25% | 45 | 36 | Township |
| Wright | 13 | 1,599 | 1,612 | -0.06% | 37 | 43 | Township |
| Pittsford | 14 | 1,538 | 1,536 | 0.13% | 43 | 35 | Township |
| Litchfield | 15 | 1,393 | 1,396 | -0.07% | 502 | 3 | City |
| Moscow | 16 | 1,382 | 1,375 | 0.14% | 39 | 35 | Township |
| Wheatland | 17 | 1,344 | 1,341 | 0.15% | 38 | 36 | Township |
| Woodbridge | 18 | 1,308 | 1,312 | 0% | 44 | 30 | Township |
| Amboy | 19 | 1,177 | 1,180 | 0.09% | 39 | 30 | Township |
| Fayette | 20 | 1,107 | 1,111 | 0% | 55 | 20 | Township |
| Reading | 21 | 1,081 | 1,094 | -0.28% | 1,068 | 1 | City |
| Litchfield | 22 | 1,030 | 1,030 | 0% | 32 | 33 | Township |
| Ransom | 23 | 806 | 812 | -0.25% | 27 | 30 | Township |
| Waldron | 24 | 549 | 554 | -0.18% | 549 | 1 | Village |
| Camden | 25 | 513 | 516 | -0.19% | 640 | 1 | Village |
| North Adams | 26 | 464 | 470 | -0.22% | 872 | 1 | Village |
| Allen | 27 | 212 | 214 | -0.47% | 1,218 | 0 | Village |
Hillsdale is the largest city in Hillsdale County, with a population of 7,996.
Allen is the smallest city in Hillsdale County, with a population of 212.
There are 27 cities in Hillsdale County, Michigan.