9 cities
| City | Rank | 2026 Pop. ↓ | 2020 Pop. | Annual Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Waverly | 1 | 10,656 | 10,416 | 0.38% | 946 | 11 | City |
| Sumner | 2 | 2,032 | 2,031 | 0% | 827 | 2 | City |
| Denver | 3 | 1,969 | 1,927 | 0.36% | 1,158 | 2 | City |
| Tripoli | 4 | 1,215 | 1,193 | 0.33% | 873 | 1 | City |
| Janesville | 5 | 1,059 | 1,037 | 0.38% | 762 | 1 | City |
| Readlyn | 6 | 862 | 846 | 0.35% | 2,620 | 0 | City |
| Plainfield | 7 | 392 | 392 | 0% | 1,167 | 0 | City |
| Frederika | 8 | 207 | 204 | 0.49% | 564 | 0 | City |
| Bassett | 9 | 41 | 43 | 0% | 105 | 0 | City |
Waverly is the largest city in Bremer County, with a population of 10,656.
Bassett is the smallest city in Bremer County, with a population of 41.
There are 9 cities in Bremer County, Iowa.