| Rank | City | 2020 Population | Growth Rate (Annual) |
|---|---|---|---|
| 1 | Hamer | 85 | 5.9% |
| 2 | Star | 11,363 | 7.0% |
| 3 | Kuna | 24,553 | 4.9% |
| 4 | Meridian | 119,729 | 4.8% |
| 5 | Middleton | 9,535 | 5.6% |
| 6 | Ammon | 17,870 | 2.6% |
| 7 | Eagle | 30,917 | 4.5% |
| 8 | Iona | 2,746 | 4.3% |
| 9 | Caldwell | 60,482 | 2.7% |
| 10 | Post Falls | 39,209 | 3.6% |
| 11 | Victor | 2,174 | 1.2% |
| 12 | Kootenai | 953 | 3.5% |
| 13 | Ponderay | 1,307 | 1.4% |
| 14 | Clifton | 420 | 5.0% |
| 15 | Rexburg | 34,894 | 3.2% |
| 16 | Rathdrum | 9,290 | 3.1% |
| 17 | Dietrich | 284 | -1.5% |
| 18 | Nampa | 101,124 | 2.2% |
| 19 | Donnelly | 254 | 5.3% |
| 20 | Sugar City | 2,358 | 4.5% |
| 21 | McCall | 3,688 | 2.1% |
| 22 | Kimberly | 4,631 | 3.6% |
| 23 | Dover | 777 | 3.4% |
| 24 | Driggs | 1,981 | 1.8% |
| 25 | Spirit Lake | 2,351 | 1.9% |
| 26 | Rigby | 5,060 | 2.5% |
| 27 | Hayden | 15,630 | 1.6% |
| 28 | Chubbuck | 15,715 | 1.2% |
| 29 | Franklin | 1,029 | 4.8% |
| 30 | Atomic City | 40 | 3.3% |
| 31 | Fruitland | 6,105 | 2.7% |
| 32 | Coeur d'Alene | 54,770 | 2.2% |
| 33 | Filer | 2,761 | 1.0% |
| 34 | Irwin | 259 | 1.7% |
| 35 | Jerome | 12,309 | 1.2% |
| 36 | Twin Falls | 51,816 | 1.6% |
| 37 | Hailey | 9,148 | 1.4% |
| 38 | Mountain Home | 16,114 | 1.3% |
| 39 | Marsing | 1,232 | 1.8% |
| 40 | Bellevue | 2,549 | 1.1% |
| 41 | Emmett | 7,635 | 1.5% |
| 42 | Carey | 691 | 1.4% |
| 43 | Notus | 607 | 1.3% |
| 44 | Idaho Falls | 65,657 | 1.5% |
| 45 | Hayden Lake | 655 | 1.3% |
| 46 | Heyburn | 3,700 | 1.8% |
| 47 | Moyie Springs | 834 | 1.5% |
| 48 | Sun Valley | 1,800 | 2.5% |
| 49 | Melba | 573 | 1.1% |
| 50 | Shelley | 4,840 | 0.9% |
| 51 | Hagerman | 973 | 1.1% |
| 52 | Sandpoint | 8,596 | 1.6% |
| 53 | Tetonia | 310 | 1.4% |
| 54 | Burley | 11,661 | 1.2% |
| 55 | Oldtown | 223 | 1.9% |
| 56 | Ucon | 1,164 | 0.5% |
| 57 | Hope | 97 | 1.2% |
| 58 | Wendell | 2,912 | 0.5% |
| 59 | Weston | 514 | 1.6% |
| 60 | Boise City | 235,829 | 1.4% |
| 61 | Preston | 5,614 | 0.8% |
| 62 | Teton | 794 | 0.8% |
| 63 | Stanley | 119 | 6.6% |
| 64 | Paul | 1,198 | 0.2% |
| 65 | Moscow | 25,466 | 0.7% |
| 66 | Ketchum | 3,570 | 2.9% |
| 67 | Mud Lake | 319 | -1.1% |
| 68 | Parma | 2,092 | 0.5% |
| 69 | Dayton | 518 | 1.1% |
| 70 | Blackfoot | 12,228 | 0.3% |
| 71 | Hazelton | 807 | 0.7% |
| 72 | Shoshone | 1,641 | 1.2% |
| 73 | Ririe | 665 | 0.1% |
| 74 | East Hope | 231 | 1.0% |
| 75 | Garden City | 12,297 | 1.1% |
| 76 | Buhl | 4,566 | 1.0% |
| 77 | Homedale | 2,900 | 1.0% |
| 78 | Worley | 254 | -0.1% |
| 79 | Hansen | 1,098 | -0.4% |
| 80 | Payette | 8,180 | 1.0% |
| 81 | Swan Valley | 240 | 1.6% |
| 82 | Dalton Gardens | 2,542 | 0.9% |
| 83 | American Falls | 4,560 | 0.2% |
| 84 | Fairfield | 445 | 0.7% |
| 85 | Lewiston | 34,185 | 0.7% |
| 86 | Culdesac | 416 | 0.9% |
| 87 | St. Anthony | 3,696 | 0.4% |
| 88 | Genesee | 1,029 | 0.7% |
| 89 | Oakley | 790 | 0.3% |
| 90 | Troy | 893 | 0.4% |
| 91 | Pocatello | 56,282 | 0.4% |
| 92 | Wilder | 1,594 | 0.4% |
| 93 | Gooding | 3,685 | 0.3% |
| 94 | New Plymouth | 1,517 | -0.1% |
| 95 | Rupert | 6,091 | 0.9% |
| 96 | Firth | 523 | 0.9% |
| 97 | Inkom | 798 | -0.7% |
| 98 | Malad City | 2,289 | 0.9% |
| 99 | Council | 867 | 0.3% |
| 100 | Athol | 709 | 0.2% |
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