14 cities
| City | Rank | 2025 Pop. ↓ | 2020 Pop. | Annual Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Eel | 1 | 18,574 | 18,598 | 0.22% | 2,007 | 9 | Township |
| Logansport | 2 | 18,159 | 18,343 | -0.2% | 1,730 | 10 | City |
| Clay | 3 | 2,889 | 2,878 | 0.31% | 145 | 20 | Township |
| Jackson | 4 | 2,770 | 2,773 | 0.22% | 92 | 30 | Township |
| Noble | 5 | 1,895 | 1,888 | 0.32% | 73 | 26 | Township |
| Boone | 6 | 1,388 | 1,382 | 0.36% | 39 | 35 | Township |
| Jefferson | 7 | 1,305 | 1,292 | 0.46% | 37 | 36 | Township |
| Galveston | 8 | 1,270 | 1,284 | -0.24% | 2,209 | 1 | Town |
| Walton | 9 | 999 | 963 | 0.71% | 2,334 | 0 | Town |
| Deer Creek | 10 | 889 | 887 | 0.23% | 25 | 36 | Township |
| Adams | 11 | 868 | 863 | 0.35% | 30 | 29 | Township |
| Royal Center | 12 | 796 | 798 | 0% | 1,394 | 1 | Town |
| Harrison | 13 | 745 | 743 | 0.27% | 21 | 35 | Township |
| Onward | 14 | 77 | 77 | 0% | 748 | 0 | Town |
Eel is the largest city in Cass County, with a population of 18,574.
Onward is the smallest city in Cass County, with a population of 77.
There are 14 cities in Cass County, Indiana.