| City | Rank | 2026 Pop. ↓ | 2020 Pop. | Annual Change | Density (/mi²) | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Olivia | 1 | 2,275 | 2,350 | -0.57% | 940 | 2 | City |
| Renville | 2 | 1,260 | 1,298 | -0.63% | 954 | 1 | City |
| Fairfax | 3 | 1,194 | 1,247 | -0.75% | 911 | 1 | City |
| Hector | 4 | 982 | 1,022 | -0.71% | 544 | 2 | City |
| Bird Island | 5 | 974 | 1,011 | -0.71% | 665 | 1 | City |
| Buffalo Lake | 6 | 634 | 653 | -0.47% | 930 | 1 | City |
| Franklin | 7 | 514 | 496 | 0.78% | 511 | 1 | City |
| Sacred Heart | 8 | 487 | 507 | -0.61% | 491 | 1 | City |
| Danube | 9 | 439 | 456 | -0.68% | 901 | 0 | City |
| Morton | 10 | 393 | 411 | -0.76% | 325 | 1 | City |
Olivia is the largest city in Renville County, with a population of 2,275.
Morton is the smallest city in Renville County, with a population of 393.
There are 10 cities in Renville County, Minnesota.