27 cities
| City | Rank | 2025 Pop. ↓ | 2020 Pop. | Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Montville township | 1 | 13,540 | 13,149 | 0.71% | 635 | 21.32 | Township |
| Chesterland | 2 | 8,516 | 7,415 | 4.93% | 607 | 14.02 | CDP |
| Munson township | 3 | 7,069 | 7,081 | -0.1% | 280 | 25.24 | Township |
| Mentor-on-the-Lake | 4 | 7,055 | 7,127 | -0.2% | 4,374 | 1.61 | City |
| Kirtland | 5 | 6,868 | 6,937 | -0.2% | 412 | 16.67 | City |
| Auburn township | 6 | 6,579 | 6,570 | -0.02% | 238 | 27.68 | Township |
| Russell township | 7 | 5,386 | 5,400 | -0.11% | 281 | 19.18 | Township |
| Chardon | 8 | 5,237 | 5,242 | -0.02% | 1,193 | 4.39 | City |
| Newbury township | 9 | 5,226 | 5,244 | -0.13% | 188 | 27.74 | Township |
| Hambden township | 10 | 4,707 | 4,680 | 0.06% | 211 | 22.28 | Township |
| Middlefield township | 11 | 4,512 | 4,513 | -0.04% | 201 | 22.42 | Township |
| Chardon township | 12 | 4,495 | 4,489 | -0.02% | 197 | 22.87 | Township |
| Parkman township | 13 | 4,442 | 4,452 | -0.11% | 165 | 26.84 | Township |
| Burton township | 14 | 4,365 | 4,378 | -0.11% | 183 | 23.80 | Township |
| Huntsburg township | 15 | 3,645 | 3,656 | -0.11% | 154 | 23.68 | Township |
| Claridon township | 16 | 3,108 | 3,098 | 0.03% | 139 | 22.32 | Township |
| Middlefield | 17 | 2,750 | 2,750 | 0% | 814 | 3.38 | Village |
| Thompson township | 18 | 2,151 | 2,153 | -0.09% | 84 | 25.65 | Township |
| Montville township | 19 | 1,925 | 1,935 | -0.21% | 80 | 24.20 | Township |
| Burton | 20 | 1,408 | 1,412 | -0.07% | 1,266 | 1.11 | Village |
| Thompson township | 21 | 1,379 | 1,406 | -0.14% | 37 | 37.33 | Township |
| Bass Lake | 22 | 944 | 499 | 7.15% | 1,057 | 0.89 | CDP |
| Thompson township | 23 | 779 | 676 | 2.64% | 39 | 20.20 | Township |
| Kirtland Hills | 24 | 687 | 691 | -0.15% | 123 | 5.57 | Village |
| Waite Hill | 25 | 518 | 540 | -0.77% | 124 | 4.18 | Village |
| Aquilla | 26 | 305 | 307 | 0% | 2,075 | 0.15 | Village |
| Parkman | 27 | 142 | 166 | 6.77% | 199 | 0.71 | CDP |
Montville township is the largest city in Geauga County, with a population of 13,540.
Parkman is the smallest city in Geauga County.
There are 27 cities in Geauga County, Ohio.