26 cities
| City | Rank | 2025 Pop. ↓ | 2020 Pop. | Annual Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Neosho | 1 | 14,046 | 12,713 | 1.92% | 892 | 16 | City |
| Neosho | 2 | 14,046 | 12,726 | 1.92% | 892 | 16 | City |
| Seneca | 3 | 2,335 | 2,236 | 0.82% | 912 | 3 | City |
| Seneca | 4 | 2,335 | 2,239 | 0.82% | 912 | 3 | City |
| Granby | 5 | 2,109 | 2,047 | 0.57% | 477 | 4 | City |
| Granby | 6 | 2,109 | 2,048 | 0.57% | 477 | 4 | City |
| Diamond | 7 | 904 | 834 | 1.57% | 1,210 | 1 | Town |
| Diamond | 8 | 904 | 834 | 1.57% | 1,210 | 1 | Town |
| Fairview | 9 | 785 | 733 | 1.42% | 25 | 31 | Township |
| Fairview | 10 | 785 | 735 | 1.42% | 25 | 31 | Township |
| Fairview | 11 | 432 | 419 | 0.47% | 915 | 0 | Town |
| Fairview | 12 | 432 | 419 | 0.47% | 915 | 0 | Town |
| Fairview | 13 | 417 | 408 | 0.24% | 9 | 46 | Township |
| Fairview | 14 | 417 | 408 | 0.24% | 9 | 46 | Township |
| Saginaw | 15 | 333 | 300 | 1.83% | 404 | 1 | Village |
| Saginaw | 16 | 333 | 300 | 1.83% | 404 | 1 | Village |
| Newtonia | 17 | 214 | 208 | 0.47% | 656 | 0 | Town |
| Newtonia | 18 | 214 | 208 | 0.47% | 656 | 0 | Town |
| Stella | 19 | 170 | 165 | 0.59% | 1,043 | 0 | Town |
| Stella | 20 | 170 | 165 | 0.59% | 1,043 | 0 | Town |
| Fairview | 21 | 162 | 160 | -0.61% | 5 | 36 | Township |
| Fairview | 22 | 162 | 160 | -0.61% | 5 | 36 | Township |
| Stark City | 23 | 130 | 127 | 0% | 399 | 0 | Town |
| Stark City | 24 | 130 | 127 | 0% | 399 | 0 | Town |
| Ritchey | 25 | 68 | 66 | 0% | 1,388 | 0 | Town |
| Ritchey | 26 | 68 | 66 | 0% | 1,388 | 0 | Town |
Neosho is the largest city in Newton County, with a population of 14,046.
Ritchey is the smallest city in Newton County, with a population of 68.
There are 26 cities in Newton County, Missouri.