11 cities
| City | Rank | 2025 Pop. ↓ | 2020 Pop. | Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Columbia township | 1 | 12,092 | 11,773 | 0.51% | 329 | 36.71 | Township |
| Columbia City | 2 | 10,244 | 9,949 | 0.58% | 1,866 | 5.49 | City |
| Smith township | 3 | 5,323 | 5,255 | 0.34% | 152 | 34.97 | Township |
| Thorncreek township | 4 | 4,279 | 4,188 | 0.54% | 122 | 35.18 | Township |
| Cleveland township | 5 | 3,364 | 3,328 | 0.33% | 69 | 49.02 | Township |
| Union township | 6 | 2,723 | 2,642 | 0.63% | 74 | 36.96 | Township |
| Jefferson township | 7 | 2,285 | 2,234 | 0.57% | 65 | 35.08 | Township |
| Etna-Troy township | 8 | 1,913 | 1,868 | 0.53% | 54 | 35.20 | Township |
| Churubusco | 9 | 1,860 | 1,875 | -0.16% | 1,766 | 1.05 | Town |
| South Whitley | 10 | 1,816 | 1,820 | -0.06% | 2,131 | 0.85 | Town |
| Larwill | 11 | 272 | 271 | 0% | 1,520 | 0.18 | Town |
Columbia township is the largest city in Whitley County, with a population of 12,092.
Larwill is the smallest city in Whitley County.
There are 11 cities in Whitley County, Indiana.