| City | Rank | 2026 Pop. ↓ | 2020 Pop. | Annual Change | Density (/mi²) | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Fort Sumner | 1 | 846 | 877 | -0.7% | 255 | 3 | Village |
Fort Sumner is the largest city in De Baca County, with a population of 846.
Fort Sumner is the smallest city in De Baca County, with a population of 846.
There is 1 city in De Baca County, New Mexico.