5 cities
| City | Rank | 2025 Pop. ↓ | 2020 Pop. | Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Marshall | 1 | 24,634 | 23,344 | 1.06% | 828 | 29.76 | City |
| Hallsville | 2 | 5,155 | 4,297 | 3.45% | 1,354 | 3.81 | City |
| Waskom | 3 | 1,963 | 1,905 | 0.62% | 732 | 2.68 | City |
| Scottsville | 4 | 336 | 333 | 0.3% | 255 | 1.32 | City |
| Uncertain | 5 | 87 | 87 | 0% | 162 | 0.54 | City |
Marshall is the largest city in Harrison County, with a population of 24,634.
Uncertain is the smallest city in Harrison County.
There are 5 cities in Harrison County, Texas.