10 cities
| City | Rank | 2026 Pop. ↓ | 2020 Pop. | Annual Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Olivia | 1 | 2,284 | 2,350 | -0.48% | 943 | 2 | City |
| Renville | 2 | 1,257 | 1,299 | -0.55% | 952 | 1 | City |
| Fairfax | 3 | 1,203 | 1,244 | -0.58% | 918 | 1 | City |
| Hector | 4 | 981 | 1,019 | -0.61% | 543 | 2 | City |
| Bird Island | 5 | 974 | 1,009 | -0.61% | 665 | 1 | City |
| Buffalo Lake | 6 | 636 | 651 | -0.31% | 933 | 1 | City |
| Franklin | 7 | 525 | 497 | 0.96% | 522 | 1 | City |
| Sacred Heart | 8 | 487 | 507 | -0.61% | 491 | 1 | City |
| Danube | 9 | 442 | 457 | -0.45% | 908 | 0 | City |
| Morton | 10 | 397 | 411 | -0.5% | 328 | 1 | City |
Olivia is the largest city in Renville County, with a population of 2,284.
Morton is the smallest city in Renville County, with a population of 397.
There are 10 cities in Renville County, Minnesota.