8 cities
| City | Rank | 2025 Pop. ↓ | 2020 Pop. | Annual Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Auburn | 1 | 3,470 | 3,483 | -0.09% | 1,592 | 2 | City |
| Nemaha | 2 | 727 | 728 | 0% | 20 | 36 | Township |
| Peru | 3 | 684 | 678 | 0.15% | 1,300 | 1 | City |
| Johnson | 4 | 303 | 308 | -0.33% | 1,377 | 0 | Village |
| Brownville | 5 | 139 | 141 | -0.71% | 213 | 1 | Village |
| Brock | 6 | 117 | 120 | -0.85% | 374 | 0 | Village |
| Nemaha | 7 | 109 | 111 | -0.91% | 360 | 0 | Village |
| Julian | 8 | 46 | 46 | 0% | 442 | 0 | Village |
Auburn is the largest city in Nemaha County, with a population of 3,470.
Julian is the smallest city in Nemaha County, with a population of 46.
There are 8 cities in Nemaha County, Nebraska.