| City | Rank | 2026 Pop. ↓ | 2020 Pop. | Annual Change | Density (/mi²) | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Lamar | 1 | 4,349 | 4,264 | 0.28% | 834 | 5 | City |
| Golden City | 2 | 659 | 653 | 0% | 637 | 1 | City |
| Liberal | 3 | 639 | 631 | 0.16% | 757 | 1 | City |
| Mindenmines | 4 | 276 | 272 | 0% | 76 | 4 | City |
| Asbury | 5 | 195 | 191 | 0% | 534 | 0 | City |
| Lamar Heights | 6 | 171 | 169 | 0% | 218 | 1 | City |
| Milford | 7 | 27 | 27 | 0% | 643 | 0 | Village |
Lamar is the largest city in Barton County, with a population of 4,349.
Milford is the smallest city in Barton County, with a population of 27.
There are 7 cities in Barton County, Missouri.