9 cities
| City | Rank | 2025 Pop. ↓ | 2020 Pop. | Annual Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Waverly | 1 | 10,616 | 10,416 | 0.38% | 943 | 11 | City |
| Sumner | 2 | 2,032 | 2,031 | 0% | 827 | 2 | City |
| Denver | 3 | 1,962 | 1,927 | 0.36% | 1,154 | 2 | City |
| Tripoli | 4 | 1,211 | 1,193 | 0.25% | 870 | 1 | City |
| Janesville | 5 | 1,055 | 1,037 | 0.29% | 759 | 1 | City |
| Readlyn | 6 | 859 | 846 | 0.23% | 2,611 | 0 | City |
| Plainfield | 7 | 392 | 392 | 0% | 1,167 | 0 | City |
| Frederika | 8 | 206 | 204 | 0% | 561 | 0 | City |
| Bassett | 9 | 41 | 43 | -2.38% | 105 | 0 | City |
Waverly is the largest city in Bremer County, with a population of 10,616.
Bassett is the smallest city in Bremer County, with a population of 41.
There are 9 cities in Bremer County, Iowa.