10 cities
| City | Rank | 2025 Pop. ↓ | 2020 Pop. | Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Olivia | 1 | 2,250 | 2,347 | -0.84% | 929 | 2.42 | City |
| Renville | 2 | 1,241 | 1,300 | -0.96% | 939 | 1.32 | City |
| Fairfax | 3 | 1,190 | 1,247 | -0.92% | 908 | 1.31 | City |
| Hector | 4 | 970 | 1,019 | -1.02% | 537 | 1.81 | City |
| Bird Island | 5 | 959 | 1,004 | -0.93% | 655 | 1.46 | City |
| Buffalo Lake | 6 | 624 | 653 | -0.95% | 915 | 0.68 | City |
| Franklin | 7 | 521 | 493 | 1.17% | 518 | 1 | City |
| Sacred Heart | 8 | 478 | 507 | -1.24% | 482 | 0.99 | City |
| Danube | 9 | 436 | 458 | -0.91% | 895 | 0.49 | City |
| Morton | 10 | 389 | 409 | -1.02% | 321 | 1.21 | City |
Olivia is the largest city in Renville County, with a population of 2,250.
Morton is the smallest city in Renville County.
There are 10 cities in Renville County, Minnesota.