29 cities
| City | Rank | 2025 Pop. ↓ | 2020 Pop. | Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Lansing | 1 | 111,814 | 112,566 | -0.13% | 2,853 | 39.19 | City |
| Delta charter township | 2 | 33,269 | 33,126 | 0.31% | 1,026 | 32.41 | Township |
| Waverly | 3 | 23,673 | 24,050 | -0.07% | 2,601 | 9.10 | CDP |
| Charlotte | 4 | 9,209 | 9,291 | -0.17% | 1,428 | 6.45 | City |
| Grand Ledge | 5 | 7,777 | 7,794 | -0.04% | 2,018 | 3.85 | City |
| Windsor charter township | 6 | 7,148 | 7,138 | 0.08% | 207 | 34.49 | Township |
| Eaton Rapids | 7 | 5,135 | 5,209 | -0.29% | 1,414 | 3.63 | City |
| Eaton township | 8 | 3,989 | 3,998 | 0.03% | 125 | 32.03 | Township |
| Eaton Rapids township | 9 | 3,985 | 3,990 | 0.03% | 117 | 33.99 | Township |
| Oneida charter township | 10 | 3,933 | 3,986 | -0.3% | 122 | 32.27 | Township |
| Hamlin township | 11 | 3,235 | 3,226 | 0.12% | 94 | 34.27 | Township |
| Bellevue township | 12 | 3,188 | 3,202 | -0.06% | 88 | 36.38 | Township |
| Potterville | 13 | 3,115 | 3,057 | 0.39% | 1,784 | 1.75 | City |
| Carmel township | 14 | 2,828 | 2,838 | -0.04% | 83 | 34.02 | Township |
| Benton township | 15 | 2,763 | 2,764 | 0.07% | 83 | 33.48 | Township |
| Edgemont Park | 16 | 2,465 | 2,413 | 0.28% | 2,966 | 0.83 | CDP |
| Walton township | 17 | 2,287 | 2,293 | -0.04% | 65 | 35.21 | Township |
| Sunfield township | 18 | 2,037 | 2,042 | -0.05% | 56 | 36.09 | Township |
| Vermontville township | 19 | 1,950 | 1,948 | 0.1% | 54 | 36.11 | Township |
| Kalamo township | 20 | 1,773 | 1,766 | 0.11% | 48 | 36.59 | Township |
| Chester township | 21 | 1,756 | 1,766 | -0.11% | 49 | 36.03 | Township |
| Roxand township | 22 | 1,743 | 1,751 | -0.06% | 48 | 36.42 | Township |
| Brookfield township | 23 | 1,460 | 1,463 | 0% | 40 | 36.07 | Township |
| Bellevue | 24 | 1,332 | 1,347 | -0.22% | 1,310 | 1.02 | Village |
| Olivet | 25 | 1,234 | 1,516 | -4.34% | 1,210 | 1.02 | City |
| Dimondale | 26 | 1,166 | 1,175 | -0.17% | 1,310 | 0.89 | Village |
| Vermontville | 27 | 747 | 747 | 0% | 590 | 1.27 | Village |
| Mulliken | 28 | 543 | 548 | -0.18% | 520 | 1.04 | Village |
| Sunfield | 29 | 539 | 536 | 0.19% | 710 | 0.76 | Village |
Lansing is the largest city in Eaton County, with a population of 111,814.
Sunfield is the smallest city in Eaton County.
There are 29 cities in Eaton County, Michigan.