16 cities
| City | Rank | 2025 Pop. ↓ | 2020 Pop. | Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Cambridge | 1 | 11,059 | 9,683 | 2.55% | 1,478 | 7.48 | City |
| Isanti | 2 | 7,694 | 6,883 | 2.15% | 1,511 | 5.09 | City |
| Bradford township | 3 | 3,598 | 3,434 | 1.21% | 105 | 34.16 | Township |
| Cambridge township | 4 | 2,606 | 2,497 | 1.09% | 89 | 29.27 | Township |
| Stanford township | 5 | 2,414 | 2,315 | 1.05% | 63 | 38.34 | Township |
| Isanti township | 6 | 2,379 | 2,277 | 1.1% | 88 | 26.97 | Township |
| Athens township | 7 | 2,191 | 2,124 | 0.92% | 71 | 30.75 | Township |
| Wyanett township | 8 | 1,853 | 1,773 | 1.15% | 56 | 33.06 | Township |
| Braham | 9 | 1,790 | 1,797 | -0.06% | 1,102 | 1.63 | City |
| Spencer Brook township | 10 | 1,746 | 1,673 | 1.1% | 52 | 33.73 | Township |
| Springvale township | 11 | 1,647 | 1,575 | 1.17% | 48 | 34.32 | Township |
| Stanchfield township | 12 | 1,206 | 1,156 | 1.09% | 36 | 33.34 | Township |
| Oxford township | 13 | 1,023 | 985 | 0.89% | 45 | 22.52 | Township |
| Dalbo township | 14 | 816 | 784 | 0.99% | 23 | 35.37 | Township |
| Maple Ridge township | 15 | 754 | 718 | 1.34% | 22 | 35.02 | Township |
| Stanchfield | 16 | 88 | 73 | -2.22% | 119 | 0.74 | CDP |
Cambridge is the largest city in Isanti County, with a population of 11,059.
Stanchfield is the smallest city in Isanti County.
There are 16 cities in Isanti County, Minnesota.