20 cities
| City | Rank | 2026 Pop. ↓ | 2020 Pop. | Annual Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Plankinton | 1 | 762 | 764 | 0% | 999 | 1 | City |
| White Lake | 2 | 397 | 393 | 0.25% | 980 | 0 | City |
| Stickney | 3 | 310 | 318 | -0.32% | 1,157 | 0 | Town |
| Plankinton | 4 | 209 | 210 | -0.48% | 6 | 34 | Township |
| White Lake | 5 | 81 | 83 | -2.41% | 2 | 36 | Township |
| Dudley | 6 | 79 | 81 | -2.47% | 2 | 35 | Township |
| Center | 7 | 77 | 77 | -1.28% | 2 | 36 | Township |
| Belford | 8 | 70 | 73 | -2.78% | 2 | 36 | Township |
| Palatine | 9 | 68 | 66 | 0% | 2 | 37 | Township |
| Hopper | 10 | 63 | 63 | -1.56% | 2 | 36 | Township |
| Truro | 11 | 60 | 61 | -1.64% | 2 | 35 | Township |
| Pleasant Lake | 12 | 58 | 59 | -1.69% | 2 | 34 | Township |
| Firesteel | 13 | 55 | 49 | 3.77% | 1 | 37 | Township |
| Lake | 14 | 52 | 52 | -1.89% | 2 | 34 | Township |
| Gales | 15 | 45 | 48 | -2.17% | 1 | 36 | Township |
| Crystal Lake | 16 | 39 | 42 | -2.5% | 1 | 36 | Township |
| Washington | 17 | 39 | 42 | -2.5% | 1 | 36 | Township |
| Patten | 18 | 38 | 41 | -2.56% | 1 | 36 | Township |
| Pleasant Valley | 19 | 22 | 22 | 0% | 1 | 35 | Township |
| Cooper | 20 | 17 | 17 | 0% | 1 | 34 | Township |
Plankinton is the largest city in Aurora County, with a population of 762.
Cooper is the smallest city in Aurora County, with a population of 17.
There are 20 cities in Aurora County, South Dakota.