15 cities
| City | Rank | 2026 Pop. ↓ | 2020 Pop. | Annual Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Cambridge | 1 | 11,619 | 9,683 | 2.86% | 1,553 | 7 | City |
| Isanti | 2 | 7,799 | 6,880 | 2% | 1,532 | 5 | City |
| Bradford | 3 | 3,473 | 3,433 | -0.4% | 102 | 34 | Township |
| Cambridge | 4 | 2,528 | 2,499 | -0.35% | 86 | 29 | Township |
| Stanford | 5 | 2,336 | 2,314 | -0.43% | 61 | 38 | Township |
| Isanti | 6 | 2,310 | 2,278 | -0.3% | 86 | 27 | Township |
| Athens | 7 | 2,136 | 2,115 | -0.09% | 69 | 31 | Township |
| Wyanett | 8 | 1,789 | 1,772 | -0.39% | 54 | 33 | Township |
| Braham | 9 | 1,765 | 1,798 | -0.28% | 1,086 | 2 | City |
| Spencer Brook | 10 | 1,688 | 1,672 | -0.41% | 50 | 34 | Township |
| Springvale | 11 | 1,588 | 1,575 | -0.5% | 46 | 34 | Township |
| Stanchfield | 12 | 1,171 | 1,158 | -0.34% | 35 | 33 | Township |
| Oxford | 13 | 1,002 | 986 | -0.2% | 44 | 23 | Township |
| Dalbo | 14 | 787 | 785 | -0.63% | 22 | 35 | Township |
| Maple Ridge | 15 | 726 | 718 | -0.27% | 21 | 35 | Township |
Cambridge is the largest city in Isanti County, with a population of 11,619.
Maple Ridge is the smallest city in Isanti County, with a population of 726.
There are 15 cities in Isanti County, Minnesota.