3 cities
| City | Rank | 2026 Pop. ↓ | 2020 Pop. | Annual Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Woonsocket | 1 | 653 | 631 | 0.62% | 833 | 1 | City |
| Letcher | 2 | 162 | 153 | 1.25% | 263 | 1 | Town |
| Artesian | 3 | 137 | 130 | 0.74% | 247 | 1 | Town |
Woonsocket is the largest city in Sanborn County, with a population of 653.
Artesian is the smallest city in Sanborn County, with a population of 137.
There are 3 cities in Sanborn County, South Dakota.