22 cities
| City | Rank | 2025 Pop. ↓ | 2020 Pop. | Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Lamar | 1 | 4,326 | 4,265 | 0.28% | 830 | 5.21 | City |
| City township | 2 | 4,326 | 4,265 | 0.28% | 830 | 5.21 | Township |
| Lamar township | 3 | 1,433 | 1,409 | 0.35% | 23 | 62.81 | Township |
| Golden City township | 4 | 998 | 986 | 0.3% | 25 | 40.26 | Township |
| Golden City | 5 | 659 | 654 | 0.15% | 637 | 1.03 | City |
| Liberal | 6 | 641 | 630 | 0.31% | 759 | 0.84 | City |
| South West township | 7 | 571 | 558 | 0.53% | 11 | 51.24 | Township |
| Central township | 8 | 537 | 533 | 0% | 10 | 54.20 | Township |
| Nashville township | 9 | 392 | 388 | 0.26% | 8 | 48.30 | Township |
| Newport township | 10 | 368 | 368 | -0.27% | 12 | 30.22 | Township |
| Mindenmines | 11 | 273 | 270 | 0.37% | 75 | 3.65 | City |
| Northfork township | 12 | 264 | 260 | 0.38% | 8 | 32.86 | Township |
| Barton City township | 13 | 261 | 257 | 0.38% | 7 | 36.62 | Township |
| Doylesport township | 14 | 259 | 246 | 1.57% | 7 | 35.98 | Township |
| Milford township | 15 | 253 | 249 | 0.4% | 8 | 29.93 | Township |
| Leroy township | 16 | 236 | 232 | 0.43% | 6 | 40.04 | Township |
| Asbury | 17 | 191 | 191 | 0% | 523 | 0.36 | City |
| Lamar Heights | 18 | 174 | 171 | 0.58% | 222 | 0.78 | City |
| Iantha | 19 | 95 | 44 | 6.74% | 352 | 0.27 | CDP |
| Burgess | 20 | 52 | 33 | 6.12% | 464 | 0.11 | CDP |
| Irwin | 21 | 51 | 22 | 6.25% | 172 | 0.30 | CDP |
| Milford | 22 | 27 | 27 | 0% | 643 | 0.04 | Village |
Lamar is the largest city in Barton County, with a population of 4,326.
Milford is the smallest city in Barton County.
There are 22 cities in Barton County, Missouri.