16 cities
| City | Rank | 2025 Pop. ↓ | 2020 Pop. | Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Zionsville | 1 | 33,665 | 30,837 | 1.71% | 501 | 67.19 | Town |
| Center township | 2 | 19,870 | 18,844 | 1.24% | 304 | 65.33 | Township |
| Lebanon | 3 | 17,610 | 16,715 | 1.03% | 1,018 | 17.31 | City |
| Whitestown | 4 | 14,849 | 10,349 | 6.45% | 950 | 15.63 | Town |
| Worth township | 5 | 6,438 | 4,508 | 6.93% | 419 | 15.36 | Township |
| Jamestown township | 6 | 3,318 | 3,225 | 0.55% | 160 | 20.70 | Township |
| Jackson township | 7 | 2,794 | 2,749 | 0.43% | 59 | 47.68 | Township |
| Sugar Creek township | 8 | 2,169 | 2,167 | 0.32% | 65 | 33.57 | Township |
| Jefferson township | 9 | 1,519 | 1,490 | 0.66% | 33 | 46.47 | Township |
| Thorntown | 10 | 1,406 | 1,431 | -0.35% | 2,294 | 0.61 | Town |
| Lake Holiday | 11 | 1,385 | 1,376 | 2.37% | 535 | 2.59 | CDP |
| Perry township | 12 | 1,163 | 829 | 6.6% | 162 | 7.17 | Township |
| Jamestown | 13 | 957 | 942 | 0.31% | 1,069 | 0.90 | Town |
| Harrison township | 14 | 724 | 715 | 0.42% | 30 | 24.38 | Township |
| Advance | 15 | 507 | 502 | 0.2% | 861 | 0.59 | Town |
| Ulen | 16 | 112 | 114 | 0% | 491 | 0.23 | Town |
Zionsville is the largest city in Boone County, with a population of 33,665.
Ulen is the smallest city in Boone County.
There are 16 cities in Boone County, Indiana.