46 cities
| City | Rank | 2025 Pop. ↓ | 2020 Pop. | Annual Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Bethany | 1 | 3,305 | 3,313 | -0.36% | 92 | 36 | Township |
| Bethany | 2 | 3,305 | 3,313 | -0.36% | 92 | 36 | Township |
| Bethany | 3 | 2,913 | 2,908 | 0.03% | 656 | 4 | City |
| Bethany | 4 | 2,913 | 2,907 | 0.03% | 656 | 4 | City |
| Colfax | 5 | 580 | 580 | -0.51% | 14 | 43 | Township |
| Colfax | 6 | 580 | 580 | -0.51% | 14 | 43 | Township |
| White Oak | 7 | 456 | 452 | 0% | 13 | 36 | Township |
| White Oak | 8 | 456 | 452 | 0% | 13 | 36 | Township |
| Sugar Creek | 9 | 451 | 449 | -0.22% | 15 | 30 | Township |
| Sugar Creek | 10 | 451 | 449 | -0.22% | 15 | 30 | Township |
| Grant | 11 | 381 | 381 | -0.26% | 11 | 34 | Township |
| Grant | 12 | 381 | 381 | -0.26% | 11 | 34 | Township |
| Ridgeway | 13 | 377 | 374 | 0% | 310 | 1 | City |
| Ridgeway | 14 | 377 | 374 | 0% | 310 | 1 | City |
| Marion | 15 | 363 | 363 | -0.27% | 10 | 35 | Township |
| Marion | 16 | 363 | 363 | -0.27% | 10 | 35 | Township |
| Gilman City | 17 | 329 | 329 | 0% | 391 | 1 | City |
| Gilman City | 18 | 329 | 329 | 0% | 391 | 1 | City |
| Jefferson | 19 | 327 | 328 | -0.3% | 9 | 36 | Township |
| Jefferson | 20 | 327 | 328 | -0.3% | 9 | 36 | Township |
| Cainsville | 21 | 282 | 282 | 0% | 206 | 1 | City |
| Cainsville | 22 | 282 | 282 | 0% | 206 | 1 | City |
| Eagleville | 23 | 280 | 280 | 0% | 277 | 1 | Town |
| Eagleville | 24 | 280 | 280 | 0% | 277 | 1 | Town |
| New Hampton | 25 | 227 | 225 | 0% | 413 | 1 | City |
| New Hampton | 26 | 227 | 225 | 0% | 413 | 1 | City |
| Dallas | 27 | 215 | 215 | -0.46% | 6 | 36 | Township |
| Dallas | 28 | 215 | 215 | -0.46% | 6 | 36 | Township |
| Blythedale | 29 | 210 | 209 | 0% | 684 | 0 | Village |
| Blythedale | 30 | 210 | 209 | 0% | 684 | 0 | Village |
| Sherman | 31 | 191 | 191 | -0.52% | 5 | 35 | Township |
| Sherman | 32 | 191 | 191 | -0.52% | 5 | 35 | Township |
| Trail Creek | 33 | 191 | 191 | -0.52% | 5 | 36 | Township |
| Trail Creek | 34 | 191 | 191 | -0.52% | 5 | 36 | Township |
| Cypress | 35 | 161 | 161 | -0.62% | 5 | 30 | Township |
| Cypress | 36 | 161 | 161 | -0.62% | 5 | 30 | Township |
| Adams | 37 | 133 | 132 | 0% | 4 | 30 | Township |
| Adams | 38 | 133 | 132 | 0% | 4 | 30 | Township |
| Fox Creek | 39 | 101 | 100 | 0% | 3 | 36 | Township |
| Fox Creek | 40 | 101 | 100 | 0% | 3 | 36 | Township |
| Mount Moriah | 41 | 76 | 76 | 0% | 75 | 1 | Town |
| Mount Moriah | 42 | 76 | 76 | 0% | 75 | 1 | Town |
| Clay | 43 | 64 | 65 | -1.54% | 1 | 44 | Township |
| Clay | 44 | 64 | 65 | -1.54% | 1 | 44 | Township |
| Irena | 45 | 12 | 14 | -7.69% | 14 | 1 | Village |
| Irena | 46 | 12 | 14 | -7.69% | 14 | 1 | Village |
Bethany is the largest city in Harrison County, with a population of 3,305.
Irena is the smallest city in Harrison County, with a population of 12.
There are 46 cities in Harrison County, Missouri.