11 cities
| City | Rank | 2026 Pop. ↓ | 2020 Pop. | Annual Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Columbia | 1 | 12,089 | 11,764 | 0.34% | 329 | 37 | Township |
| Columbia City | 2 | 10,294 | 9,966 | 0.54% | 1,875 | 5 | City |
| Smith | 3 | 5,295 | 5,254 | 0.04% | 151 | 35 | Township |
| Thorncreek | 4 | 4,254 | 4,195 | 0.09% | 121 | 35 | Township |
| Cleveland | 5 | 3,437 | 3,331 | 0.85% | 70 | 49 | Township |
| Union | 6 | 2,729 | 2,643 | 0.37% | 74 | 37 | Township |
| Jefferson | 7 | 2,277 | 2,235 | 0.26% | 65 | 35 | Township |
| Etna-Troy | 8 | 1,919 | 1,868 | 0.31% | 55 | 35 | Township |
| South Whitley | 9 | 1,862 | 1,823 | 0.38% | 2,185 | 1 | Town |
| Churubusco | 10 | 1,849 | 1,872 | -0.22% | 1,756 | 1 | Town |
| Larwill | 11 | 277 | 273 | 0.36% | 1,547 | 0 | Town |
Columbia is the largest city in Whitley County, with a population of 12,089.
Larwill is the smallest city in Whitley County, with a population of 277.
There are 11 cities in Whitley County, Indiana.