5 cities
| City | Rank | 2026 Pop. ↓ | 2020 Pop. | Annual Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Oconto | 1 | 4,647 | 4,619 | 0.11% | 685 | 7 | City |
| Oconto Falls | 2 | 3,049 | 2,973 | 0.43% | 1,059 | 3 | City |
| Gillett | 3 | 1,264 | 1,291 | -0.32% | 936 | 1 | City |
| Lena | 4 | 540 | 533 | 0.19% | 508 | 1 | Village |
| Suring | 5 | 518 | 521 | 0% | 505 | 1 | Village |
Oconto is the largest city in Oconto County, with a population of 4,647.
Suring is the smallest city in Oconto County, with a population of 518.
There are 5 cities in Oconto County, Wisconsin.