14 cities
| City | Rank | 2025 Pop. ↓ | 2020 Pop. | Annual Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Eel | 1 | 18,299 | 18,599 | -0.71% | 1,977 | 9 | Township |
| Logansport | 2 | 18,123 | 18,345 | -0.25% | 1,727 | 10 | City |
| Clay | 3 | 2,851 | 2,879 | -0.56% | 143 | 20 | Township |
| Jackson | 4 | 2,738 | 2,772 | -0.58% | 91 | 30 | Township |
| Noble | 5 | 1,861 | 1,884 | -0.64% | 72 | 26 | Township |
| Boone | 6 | 1,362 | 1,383 | -0.73% | 39 | 35 | Township |
| Jefferson | 7 | 1,275 | 1,294 | -0.7% | 36 | 36 | Township |
| Galveston | 8 | 1,272 | 1,284 | -0.24% | 2,212 | 1 | Town |
| Walton | 9 | 984 | 962 | 0.41% | 2,299 | 0 | Town |
| Deer Creek | 10 | 877 | 887 | -0.68% | 24 | 36 | Township |
| Adams | 11 | 856 | 864 | -0.7% | 30 | 29 | Township |
| Royal Center | 12 | 791 | 799 | -0.25% | 1,385 | 1 | Town |
| Harrison | 13 | 736 | 745 | -0.67% | 21 | 35 | Township |
| Onward | 14 | 75 | 77 | -1.32% | 728 | 0 | Town |
Eel is the largest city in Cass County, with a population of 18,299.
Onward is the smallest city in Cass County, with a population of 75.
There are 14 cities in Cass County, Indiana.