3 cities
| City | Rank | 2026 Pop. ↓ | 2020 Pop. | Annual Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Truth or Consequences | 1 | 5,890 | 6,045 | -0.44% | 210 | 28 | City |
| Elephant Butte | 2 | 1,432 | 1,452 | -0.21% | 343 | 4 | City |
| Williamsburg | 3 | 458 | 464 | -0.22% | 942 | 0 | Village |
Truth or Consequences is the largest city in Sierra County, with a population of 5,890.
Williamsburg is the smallest city in Sierra County, with a population of 458.
There are 3 cities in Sierra County, New Mexico.