19 cities
| City | Rank | 2025 Pop. ↓ | 2020 Pop. | Annual Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Clinton | 1 | 9,026 | 8,896 | 0.92% | 199 | 45 | Township |
| Clinton | 2 | 4,874 | 4,843 | 0.31% | 136 | 36 | Township |
| Clinton | 3 | 4,801 | 4,805 | -0.02% | 2,132 | 2 | City |
| Helt | 4 | 2,495 | 2,445 | 1.01% | 35 | 72 | Township |
| Eugene | 5 | 1,747 | 1,714 | 1.04% | 50 | 35 | Township |
| Clinton | 6 | 1,535 | 1,556 | -0.26% | 45 | 34 | Township |
| Fairview Park | 7 | 1,421 | 1,401 | 0.28% | 1,626 | 1 | Town |
| Clinton | 8 | 1,300 | 1,232 | 0.85% | 37 | 35 | Township |
| Cayuga | 9 | 955 | 949 | 0.1% | 943 | 1 | Town |
| Clinton | 10 | 946 | 913 | 1.39% | 29 | 32 | Township |
| Vermillion | 11 | 869 | 856 | 1.05% | 17 | 51 | Township |
| St. Bernice | 12 | 590 | 721 | -0.67% | 462 | 1 | CDP |
| Clinton | 13 | 571 | 577 | -0.52% | 23 | 25 | Township |
| Dana | 14 | 552 | 552 | 0% | 1,890 | 0 | Town |
| Clinton | 15 | 497 | 497 | 0.81% | 22 | 22 | Township |
| Perrysville | 16 | 462 | 454 | 0.22% | 1,798 | 0 | Town |
| Newport | 17 | 412 | 411 | 0% | 472 | 1 | Town |
| Universal | 18 | 284 | 281 | 0% | 789 | 0 | Town |
| Blanford | 19 | 110 | 248 | -12% | 259 | 0 | CDP |
Clinton is the largest city in Vermillion County, with a population of 9,026.
Blanford is the smallest city in Vermillion County, with a population of 110.
There are 19 cities in Vermillion County, Indiana.