| Rank | City | 1990 Population |
|---|---|---|
| 1 | Boise City | 135,150 |
| 2 | Pocatello | 46,091 |
| 3 | Idaho Falls | 44,235 |
| 4 | Nampa | 29,899 |
| 5 | Lewiston | 28,309 |
| 6 | Twin Falls | 28,095 |
| 7 | Coeur d'Alene | 24,480 |
| 8 | Caldwell | 18,930 |
| 9 | Moscow | 18,630 |
| 10 | Rexburg | 14,347 |
| 11 | Meridian | 10,220 |
| 12 | Blackfoot | 9,721 |
| 13 | Burley | 8,806 |
| 14 | Mountain Home | 8,173 |
| 15 | Chubbuck | 7,834 |
| 16 | Post Falls | 7,675 |
| 17 | Garden City | 6,893 |
| 18 | Jerome | 6,573 |
| 19 | Rupert | 5,931 |
| 20 | Payette | 5,842 |
| 21 | Sandpoint | 5,292 |
| 22 | Ammon | 4,973 |
| 23 | Hayden | 4,867 |
| 24 | Emmett | 4,658 |
| 25 | Weiser | 4,640 |
| 26 | Eagle | 4,577 |
| 27 | Preston | 3,812 |
| 28 | American Falls | 3,779 |
| 29 | Hailey | 3,681 |
| 30 | Shelley | 3,622 |
| 31 | Buhl | 3,565 |
| 32 | Grangeville | 3,230 |
| 33 | Orofino | 3,184 |
| 34 | Soda Springs | 3,129 |
| 35 | St. Anthony | 3,063 |
| 36 | Salmon | 3,041 |
| 37 | Gooding | 2,858 |
| 38 | Rigby | 2,762 |
| 39 | Montpelier | 2,669 |
| 40 | Heyburn | 2,650 |
| 41 | Ketchum | 2,585 |
| 42 | Kellogg | 2,570 |
| 43 | St. Maries | 2,543 |
| 44 | Fruitland | 2,494 |
| 45 | Kimberly | 2,328 |
| 46 | McCall | 2,270 |
| 47 | Bonners Ferry | 2,196 |
| 48 | Kuna | 2,130 |
| 49 | Malad City | 2,043 |
| 50 | Homedale | 2,018 |
| 51 | Rathdrum | 2,014 |
| 52 | Wendell | 1,927 |
| 53 | Dalton Gardens | 1,879 |
| 54 | Middleton | 1,868 |
| 55 | Pinehurst | 1,707 |
| 56 | Parma | 1,597 |
| 57 | Priest River | 1,594 |
| 58 | Filer | 1,575 |
| 59 | Osburn | 1,570 |
| 60 | Aberdeen | 1,403 |
| 61 | Glenns Ferry | 1,319 |
| 62 | Bellevue | 1,313 |
| 63 | New Plymouth | 1,293 |
| 64 | Shoshone | 1,256 |
| 65 | Sugar City | 1,248 |
| 66 | Wilder | 1,242 |
| 67 | Kamiah | 1,157 |
| 68 | Wallace | 1,144 |
| 69 | Iona | 1,129 |
| 70 | Ashton | 1,126 |
| 71 | Challis | 1,073 |
| 72 | Arco | 1,027 |
| 73 | Sun Valley | 976 |
| 74 | Grace | 969 |
| 75 | Paul | 936 |
| 76 | Lapwai | 909 |
| 77 | Ucon | 891 |
| 78 | Cottonwood | 875 |
| 79 | Hansen | 866 |
| 80 | Cascade | 866 |
| 81 | Driggs | 849 |
| 82 | Council | 831 |
| 83 | Spirit Lake | 829 |
| 84 | Plummer | 801 |
| 85 | Marsing | 792 |
| 86 | Potlatch | 785 |
| 87 | Inkom | 776 |
| 88 | Mullan | 763 |
| 89 | Pierce | 747 |
| 90 | McCammon | 722 |
| 91 | Genesee | 722 |
| 92 | Kooskia | 719 |
| 93 | Troy | 668 |
| 94 | Greenleaf | 658 |
| 95 | Oakley | 658 |
| 96 | Horseshoe Bend | 643 |
| 97 | Menan | 641 |
| 98 | Hagerman | 633 |
| 99 | Downey | 629 |
| 100 | Paris | 623 |
In 1990, the largest city in Idaho was Boise City, with a population of 135,150. The second largest city is Pocatello, with a population of 46,091.
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