| Annual Estimates of the Population for Counties of Idaho: April 1, 2000 to July 1, 2006 | |||||||||
| Geographic Area | Population Estimates | April 1, 2000 | |||||||
| July 1, 2006 | July 1, 2005 | July 1, 2004 | July 1, 2003 | July 1, 2002 | July 1, 2001 | July 1, 2000 | Estimates Base | Census | |
| Idaho | 1,466,465 | 1,429,367 | 1,394,524 | 1,367,428 | 1,344,266 | 1,321,446 | 1,299,811 | 1,293,956 | 1,293,953 |
| Ada County | 359,035 | 345,418 | 332,419 | 325,247 | 319,858 | 312,908 | 303,104 | 300,904 | 300,904 |
| Adams County | 3,485 | 3,542 | 3,491 | 3,466 | 3,472 | 3,440 | 3,467 | 3,476 | 3,476 |
| Bannock County | 78,443 | 77,794 | 77,785 | 77,023 | 76,917 | 76,539 | 75,597 | 75,565 | 75,565 |
| Bear Lake County | 6,167 | 6,180 | 6,255 | 6,316 | 6,299 | 6,422 | 6,426 | 6,411 | 6,411 |
| Benewah County | 9,347 | 9,165 | 9,012 | 9,006 | 9,004 | 9,023 | 9,196 | 9,171 | 9,171 |
| Bingham County | 44,051 | 43,775 | 43,126 | 42,912 | 42,362 | 42,259 | 41,814 | 41,735 | 41,735 |
| Blaine County | 21,501 | 21,173 | 21,023 | 20,680 | 20,295 | 19,770 | 19,128 | 18,991 | 18,991 |
| Boise County | 7,641 | 7,440 | 7,357 | 7,230 | 7,051 | 6,921 | 6,746 | 6,670 | 6,670 |
| Bonner County | 41,275 | 40,736 | 39,801 | 39,128 | 38,207 | 37,311 | 37,031 | 36,835 | 36,835 |
| Bonneville County | 94,630 | 91,702 | 89,697 | 87,118 | 85,243 | 83,856 | 82,902 | 82,522 | 82,522 |
| Boundary County | 10,831 | 10,563 | 10,384 | 10,169 | 9,979 | 9,871 | 9,927 | 9,871 | 9,871 |
| Butte County | 2,781 | 2,782 | 2,819 | 2,847 | 2,924 | 2,861 | 2,899 | 2,899 | 2,899 |
| Camas County | 1,088 | 1,064 | 1,015 | 1,034 | 1,037 | 1,011 | 981 | 991 | 991 |
| Canyon County | 173,302 | 164,981 | 157,889 | 151,857 | 145,560 | 139,208 | 133,113 | 131,441 | 131,441 |
| Caribou County | 6,996 | 7,094 | 7,212 | 7,193 | 7,239 | 7,388 | 7,309 | 7,304 | 7,304 |
| Cassia County | 21,365 | 21,391 | 21,379 | 21,522 | 21,551 | 21,551 | 21,413 | 21,416 | 21,416 |
| Clark County | 920 | 914 | 932 | 910 | 957 | 971 | 1,027 | 1,022 | 1,022 |
| Clearwater County | 8,324 | 8,338 | 8,367 | 8,438 | 8,459 | 8,628 | 8,895 | 8,930 | 8,930 |
| Custer County | 4,180 | 4,097 | 4,107 | 4,118 | 4,163 | 4,269 | 4,340 | 4,342 | 4,342 |
| Elmore County | 28,114 | 28,298 | 28,788 | 28,702 | 29,224 | 29,099 | 29,090 | 29,130 | 29,130 |
| Franklin County | 12,494 | 12,410 | 12,160 | 11,846 | 11,802 | 11,500 | 11,365 | 11,329 | 11,329 |
| Fremont County | 12,369 | 12,224 | 12,330 | 12,158 | 11,890 | 11,835 | 11,793 | 11,819 | 11,819 |
| Gem County | 16,558 | 16,265 | 15,937 | 15,765 | 15,574 | 15,439 | 15,218 | 15,181 | 15,181 |
| Gooding County | 14,404 | 14,424 | 14,406 | 14,329 | 14,236 | 14,226 | 14,203 | 14,158 | 14,155 |
| Idaho County | 15,762 | 15,659 | 15,637 | 15,430 | 15,508 | 15,459 | 15,474 | 15,511 | 15,511 |
| Jefferson County | 22,350 | 21,613 | 20,827 | 20,217 | 19,781 | 19,352 | 19,231 | 19,155 | 19,155 |
| Jerome County | 20,130 | 19,677 | 19,303 | 18,927 | 18,698 | 18,481 | 18,448 | 18,342 | 18,342 |
| Kootenai County | 131,507 | 127,722 | 122,375 | 117,503 | 114,272 | 111,802 | 109,550 | 108,685 | 108,685 |
| Latah County | 35,029 | 34,990 | 35,052 | 34,884 | 34,832 | 35,026 | 34,861 | 34,935 | 34,935 |
| Lemhi County | 7,930 | 7,868 | 7,827 | 7,748 | 7,749 | 7,672 | 7,746 | 7,806 | 7,806 |
| Lewis County | 3,756 | 3,739 | 3,717 | 3,738 | 3,724 | 3,621 | 3,746 | 3,747 | 3,747 |
| Lincoln County | 4,522 | 4,532 | 4,315 | 4,294 | 4,229 | 4,163 | 4,057 | 4,044 | 4,044 |
| Madison County | 31,393 | 31,207 | 30,326 | 29,732 | 28,836 | 27,376 | 27,423 | 27,467 | 27,467 |
| Minidoka County | 19,041 | 18,996 | 19,166 | 19,327 | 19,443 | 19,558 | 20,099 | 20,174 | 20,174 |
| Nez Perce County | 38,324 | 38,008 | 37,724 | 37,627 | 37,160 | 36,983 | 37,387 | 37,410 | 37,410 |
| Oneida County | 4,176 | 4,178 | 4,146 | 4,119 | 4,129 | 4,173 | 4,129 | 4,125 | 4,125 |
| Owyhee County | 11,104 | 11,037 | 11,021 | 11,098 | 10,935 | 10,927 | 10,694 | 10,644 | 10,644 |
| Payette County | 22,595 | 22,114 | 21,551 | 21,455 | 21,192 | 20,838 | 20,635 | 20,578 | 20,578 |
| Power County | 7,914 | 7,761 | 7,724 | 7,516 | 7,543 | 7,564 | 7,516 | 7,538 | 7,538 |
| Shoshone County | 13,180 | 13,038 | 12,863 | 12,965 | 13,069 | 13,448 | 13,747 | 13,771 | 13,771 |
| Teton County | 7,838 | 7,494 | 7,197 | 7,050 | 6,813 | 6,435 | 6,108 | 5,999 | 5,999 |
| Twin Falls County | 71,575 | 69,540 | 68,080 | 67,044 | 65,488 | 64,603 | 64,358 | 64,284 | 64,284 |
| Valley County | 8,836 | 8,310 | 7,935 | 7,751 | 7,603 | 7,691 | 7,642 | 7,651 | 7,651 |
| Washington County | 10,202 | 10,114 | 10,047 | 9,989 | 9,959 | 9,968 | 9,976 | 9,977 | 9,977 |
Source: Population Division, U.S. Census Bureau