18 cities
| City | Rank | 2025 Pop. ↓ | 2020 Pop. | Annual Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Lincoln | 1 | 39,709 | 34,925 | 2.42% | 1,676 | 24 | Township |
| Plainfield | 2 | 38,520 | 34,899 | 1.92% | 1,415 | 27 | Town |
| Brownsburg | 3 | 34,495 | 29,169 | 3.19% | 2,029 | 17 | Town |
| Avon | 4 | 25,505 | 21,655 | 3.11% | 1,302 | 20 | Town |
| Center | 5 | 15,929 | 13,196 | 5.97% | 346 | 46 | Township |
| Brown | 6 | 15,635 | 14,391 | 1.46% | 621 | 25 | Township |
| Danville | 7 | 12,996 | 10,673 | 3.7% | 1,292 | 10 | Town |
| Middle | 8 | 7,617 | 6,916 | 0.81% | 245 | 31 | Township |
| Pittsboro | 9 | 4,419 | 3,764 | 3.06% | 1,033 | 4 | Town |
| Clay | 10 | 2,429 | 2,355 | 0.37% | 92 | 26 | Township |
| Union | 11 | 1,878 | 1,836 | 0.11% | 78 | 24 | Township |
| Eel River | 12 | 1,768 | 1,714 | 0.34% | 42 | 42 | Township |
| Clermont | 13 | 1,385 | 1,383 | 0% | 2,073 | 1 | Town |
| Clayton | 14 | 957 | 916 | 0.84% | 1,472 | 1 | Town |
| Lizton | 15 | 507 | 506 | 0% | 693 | 1 | Town |
| North Salem | 16 | 477 | 462 | 0.63% | 1,391 | 0 | Town |
| Amo | 17 | 428 | 416 | 0.47% | 699 | 1 | Town |
| Stilesville | 18 | 278 | 268 | 0.72% | 745 | 0 | Town |
Lincoln is the largest city in Hendricks County, with a population of 39,709.
Stilesville is the smallest city in Hendricks County, with a population of 278.
There are 18 cities in Hendricks County, Indiana.