| City | Rank | 2026 Pop. ↓ | 2020 Pop. | Annual Change | Density (/mi²) | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Columbia | 1 | 6,476 | 6,765 | -0.75% | 583 | 11 | City |
Columbia is the largest city in Marion County, with a population of 6,476.
Columbia is the smallest city in Marion County, with a population of 6,476.
There is 1 city in Marion County, Mississippi.