| City | Rank | 2026 Pop. ↓ | 2020 Pop. | Annual Change | Density (/mi²) | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Jefferson | 1 | 2,062 | 2,002 | 0.29% | 464 | 4 | City |
Jefferson is the largest city in Marion County, with a population of 2,062.
Jefferson is the smallest city in Marion County, with a population of 2,062.
There is 1 city in Marion County, Texas.