24 cities
| City | Rank | 2025 Pop. ↓ | 2020 Pop. | Annual Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Faulkton | 1 | 815 | 830 | -0.37% | 805 | 1 | City |
| Myron | 2 | 148 | 144 | 1.37% | 4 | 36 | Township |
| Saratoga | 3 | 131 | 131 | 0% | 4 | 34 | Township |
| Tamworth | 4 | 105 | 104 | -0.94% | 3 | 35 | Township |
| Cresbard | 5 | 101 | 100 | 0% | 243 | 0 | Town |
| Zell | 6 | 66 | 67 | -1.49% | 2 | 35 | Township |
| Hillsdale | 7 | 58 | 56 | 0% | 2 | 36 | Township |
| Union | 8 | 50 | 47 | 0% | 2 | 33 | Township |
| Emerson | 9 | 41 | 36 | 7.89% | 1 | 36 | Township |
| Arcade | 10 | 36 | 35 | 0% | 1 | 36 | Township |
| Sherman | 11 | 35 | 34 | 0% | 1 | 35 | Township |
| Wesley | 12 | 33 | 32 | 0% | 1 | 35 | Township |
| Lafoon | 13 | 32 | 31 | 0% | 1 | 36 | Township |
| Freedom | 14 | 30 | 29 | 0% | 1 | 34 | Township |
| Ellisville | 15 | 26 | 24 | 4% | 1 | 36 | Township |
| Seneca | 16 | 23 | 22 | 0% | 55 | 0 | Town |
| Devoe | 17 | 19 | 21 | -5% | 1 | 36 | Township |
| Chelsea | 18 | 19 | 19 | 0% | 60 | 0 | Town |
| Rockham | 19 | 18 | 18 | 0% | 36 | 0 | Town |
| Pioneer | 20 | 17 | 17 | 0% | 0.00 | 35 | Township |
| Enterprise | 21 | 15 | 15 | 0% | 0.00 | 33 | Township |
| Onaka | 22 | 14 | 14 | 0% | 54 | 0 | Town |
| O'Neil | 23 | 13 | 13 | 0% | 0.00 | 35 | Township |
| Irving | 24 | 9 | 9 | 0% | 0.00 | 35 | Township |
Faulkton is the largest city in Faulk County, with a population of 815.
Irving is the smallest city in Faulk County, with a population of 9.
There are 24 cities in Faulk County, South Dakota.