11 cities
| City | Rank | 2025 Pop. ↓ | 2020 Pop. | Annual Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Oconto | 1 | 4,642 | 4,619 | 0.09% | 685 | 7 | City |
| Oconto Falls | 2 | 3,036 | 2,973 | 0.4% | 1,120 | 3 | City |
| Gillett | 3 | 1,268 | 1,291 | -0.39% | 939 | 1 | City |
| Lena | 4 | 539 | 533 | 0.19% | 507 | 1 | Village |
| Suring | 5 | 518 | 521 | -0.19% | 505 | 1 | Village |
| Sobieski | 6 | 280 | 423 | 0.36% | 222 | 1 | CDP |
| Abrams | 7 | 268 | 401 | -1.47% | 325 | 1 | CDP |
| Lakewood | 8 | 267 | 356 | -1.11% | 97 | 3 | CDP |
| Mountain | 9 | 237 | 237 | -3.27% | 35 | 7 | CDP |
| Pulcifer | 10 | 133 | 96 | 0% | 129 | 1 | CDP |
| Townsend | 11 | 74 | 110 | -5.13% | 151 | 0 | CDP |
Oconto is the largest city in Oconto County, with a population of 4,642.
Townsend is the smallest city in Oconto County, with a population of 74.
There are 11 cities in Oconto County, Wisconsin.