13 cities
| City | Rank | 2025 Pop. ↓ | 2020 Pop. | Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Neosho | 1 | 13,816 | 12,596 | 1.8% | 877 | 15.75 | City |
| Seneca | 2 | 2,330 | 2,237 | 0.82% | 911 | 2.56 | City |
| Granby | 3 | 2,103 | 2,047 | 0.53% | 475 | 4.42 | City |
| Diamond | 4 | 897 | 834 | 1.47% | 1,201 | 0.75 | Town |
| Fairview township | 5 | 771 | 735 | 0.26% | 25 | 31.45 | Township |
| Fairview | 6 | 430 | 419 | 0.47% | 911 | 0.47 | Town |
| Fairview township | 7 | 420 | 407 | 0.96% | 9 | 46.03 | Township |
| Saginaw | 8 | 330 | 300 | 1.85% | 400 | 0.82 | Village |
| Newtonia | 9 | 214 | 209 | 0.47% | 656 | 0.33 | Town |
| Stella | 10 | 170 | 165 | 0.59% | 1,043 | 0.16 | Town |
| Fairview township | 11 | 164 | 160 | 0% | 5 | 35.52 | Township |
| Stark City | 12 | 132 | 129 | 0.76% | 405 | 0.33 | Town |
| Ritchey | 13 | 67 | 66 | 0% | 1,367 | 0.05 | Town |
Neosho is the largest city in Newton County, with a population of 13,816.
Ritchey is the smallest city in Newton County.
There are 13 cities in Newton County, Missouri.