4 cities
| City | Rank | 2025 Pop. ↓ | 2020 Pop. | Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Vega | 1 | 890 | 875 | 0.34% | 665 | 1.34 | City |
| Wildorado | 2 | 246 | 150 | 6.96% | 105 | 2.35 | CDP |
| Adrian | 3 | 130 | 129 | 0% | 277 | 0.47 | City |
| Boys Ranch | 4 | 87 | 250 | -13% | 54 | 1.60 | CDP |
Vega is the largest city in Oldham County, with a population of 890.
Boys Ranch is the smallest city in Oldham County.
There are 4 cities in Oldham County, Texas.