25 cities
| City | Rank | 2025 Pop. ↓ | 2020 Pop. | Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Faulkton | 1 | 818 | 830 | -0.24% | 808 | 1.01 | City |
| Myron township | 2 | 145 | 145 | 0% | 4 | 36.04 | Township |
| Saratoga township | 3 | 131 | 131 | 0% | 4 | 34.27 | Township |
| Tamworth township | 4 | 114 | 107 | 1.79% | 3 | 34.68 | Township |
| Cresbard | 5 | 104 | 101 | 0.97% | 251 | 0.41 | Town |
| Evergreen Colony | 6 | 93 | 245 | 8.14% | 93 | 1 | CDP |
| Zell township | 7 | 67 | 66 | 0% | 2 | 34.62 | Township |
| Hillsdale township | 8 | 64 | 56 | 4.92% | 2 | 35.52 | Township |
| Union township | 9 | 48 | 47 | 0% | 1 | 32.68 | Township |
| Sherman township | 10 | 42 | 34 | 7.69% | 1 | 34.80 | Township |
| Wesley township | 11 | 38 | 32 | 5.56% | 1 | 34.56 | Township |
| Arcade township | 12 | 36 | 35 | 0% | 1 | 35.90 | Township |
| Emerson township | 13 | 36 | 34 | 2.86% | 1 | 35.78 | Township |
| Lafoon township | 14 | 34 | 31 | 3.03% | 1 | 35.91 | Township |
| Freedom township | 15 | 32 | 29 | 3.23% | 1 | 34.37 | Township |
| Ellisville township | 16 | 27 | 24 | 3.85% | 1 | 35.55 | Township |
| Seneca | 17 | 23 | 22 | 0% | 55 | 0.42 | Town |
| Rockham | 18 | 21 | 20 | 0% | 42 | 0.50 | Town |
| Devoe township | 19 | 21 | 21 | 0% | 1 | 35.55 | Township |
| Chelsea | 20 | 19 | 19 | 0% | 60 | 0.32 | Town |
| Pioneer township | 21 | 16 | 16 | 0% | 0.00 | 34.69 | Township |
| Onaka | 22 | 15 | 14 | 0% | 58 | 0.26 | Town |
| Enterprise township | 23 | 14 | 14 | 0% | 0.00 | 33.48 | Township |
| O'Neil township | 24 | 13 | 13 | 0% | 0.00 | 34.69 | Township |
| Irving township | 25 | 9 | 9 | 0% | 0.00 | 34.80 | Township |
Faulkton is the largest city in Faulk County, with a population of 818.
Irving township is the smallest city in Faulk County.
There are 25 cities in Faulk County, South Dakota.