| City | Rank | 2026 Pop. ↓ | 2020 Pop. | Annual Change | Density (/mi²) | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Carmel | 1 | 106,568 | 99,909 | 0.88% | 2,171 | 49 | City |
| Fishers | 2 | 105,932 | 99,496 | 1.07% | 2,897 | 37 | City |
| Noblesville | 3 | 77,376 | 70,206 | 1.66% | 2,171 | 36 | City |
| Westfield | 4 | 70,232 | 47,019 | 6% | 2,130 | 33 | City |
| McCordsville | 5 | 13,810 | 8,882 | 5.47% | 1,602 | 9 | Town |
| Sheridan | 6 | 5,815 | 5,212 | 1.2% | 120 | 48 | Town |
| Cicero | 7 | 5,655 | 5,316 | 1.33% | 3,471 | 2 | Town |
| Arcadia | 8 | 1,445 | 1,515 | -0.89% | 2,103 | 1 | Town |
| Atlanta | 9 | 735 | 719 | 0.55% | 2,348 | 0 | Town |
| Williams Creek | 10 | 436 | 428 | 0.23% | 1,313 | 0 | Town |
Carmel is the largest city in Hamilton County, with a population of 106,568.
Williams Creek is the smallest city in Hamilton County, with a population of 436.
There are 10 cities in Hamilton County, Indiana.