19 cities
| City | Rank | 2026 Pop. ↓ | 2020 Pop. | Annual Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Fishers | 1 | 106,228 | 99,502 | 1.07% | 2,905 | 37 | City |
| Carmel | 2 | 105,455 | 99,907 | 0.88% | 2,148 | 49 | City |
| Clay | 3 | 104,958 | 99,241 | 0.98% | 2,137 | 49 | Township |
| Noblesville | 4 | 77,777 | 70,163 | 1.66% | 2,182 | 36 | City |
| Fall Creek | 5 | 74,164 | 71,210 | -0.27% | 2,200 | 34 | Township |
| Westfield | 6 | 70,978 | 47,025 | 5.96% | 2,153 | 33 | City |
| Noblesville | 7 | 70,233 | 64,343 | 1.29% | 1,500 | 47 | Township |
| Delaware | 8 | 36,297 | 34,878 | -0.25% | 2,384 | 15 | Township |
| McCordsville | 9 | 13,172 | 8,888 | 5.73% | 1,528 | 9 | Town |
| Wayne | 10 | 11,781 | 10,969 | 1.04% | 336 | 35 | Township |
| Jackson | 11 | 11,140 | 10,883 | -0.77% | 203 | 55 | Township |
| Cicero | 12 | 8,093 | 8,081 | 0.21% | 120 | 68 | Township |
| Cicero | 13 | 5,750 | 5,321 | 1.27% | 3,530 | 2 | Town |
| Adams | 14 | 5,697 | 5,217 | 1.64% | 118 | 48 | Township |
| Sheridan | 15 | 3,675 | 3,111 | 2.62% | 76 | 48 | Town |
| White River | 16 | 2,301 | 2,429 | -0.95% | 41 | 56 | Township |
| Arcadia | 17 | 1,439 | 1,513 | -0.83% | 2,095 | 1 | Town |
| Atlanta | 18 | 745 | 721 | 0.54% | 2,380 | 0 | Town |
| Williams Creek | 19 | 429 | 428 | 0% | 1,292 | 0 | Town |
Fishers is the largest city in Hamilton County, with a population of 106,228.
Williams Creek is the smallest city in Hamilton County, with a population of 429.
There are 19 cities in Hamilton County, Indiana.