| City | Rank | 2026 Pop. ↓ | 2020 Pop. | Annual Change | Density (/mi²) | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Oconto | 1 | 4,646 | 4,621 | 0.13% | 685 | 7 | City |
| Oconto Falls | 2 | 3,025 | 2,967 | 0.43% | 1,051 | 3 | City |
| Gillett | 3 | 1,272 | 1,295 | -0.31% | 942 | 1 | City |
| Lena | 4 | 632 | 532 | 0.16% | 595 | 1 | Village |
| Suring | 5 | 507 | 511 | -0.2% | 495 | 1 | Village |
Oconto is the largest city in Oconto County, with a population of 4,646.
Suring is the smallest city in Oconto County, with a population of 507.
There are 5 cities in Oconto County, Wisconsin.