| City | Rank | 2026 Pop. ↓ | 2020 Pop. | Annual Change | Density (/mi²) | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Woonsocket | 1 | 652 | 631 | 0.46% | 832 | 1 | City |
| Letcher | 2 | 159 | 154 | 0.63% | 258 | 1 | Town |
| Artesian | 3 | 134 | 130 | 0.75% | 242 | 1 | Town |
Woonsocket is the largest city in Sanborn County, with a population of 652.
Artesian is the smallest city in Sanborn County, with a population of 134.
There are 3 cities in Sanborn County, South Dakota.