| Region 6 | |||||||||||||
| Population | |||||||||||||
| Source: Population Estimates Program, Population Division, U.S. Census Bureau WA | |||||||||||||
| 1996 | 1997 | 1998 | 1999 | 2000 | 2001 | 2002 | 2003 | 2004 | 2005 | 2006 | 2007 | 2008 | |
| Bannock | 73,431 | 73,941 | 74,272 | 74,881 | 75,565 | 75,323 | 75,804 | 75,630 | 75,672 | 78,155 | 78,443 | 79,925 | 80,812 |
| Bear Lake | 6,503 | 6,533 | 6,511 | 6,561 | 6,411 | 6,345 | 6,360 | 6,306 | 6,323 | 6,176 | 6,167 | 5,863 | 5,798 |
| Bingham | 41,185 | 41,457 | 41,825 | 42,127 | 41,735 | 42,335 | 42,458 | 42,926 | 43,205 | 43,739 | 44,051 | 43,466 | 43,903 |
| Caribou | 7,371 | 7,286 | 7,403 | 7,273 | 7,304 | 7,397 | 7,319 | 7,152 | 7,213 | 7,131 | 6,996 | 6,862 | 6,826 |
| Franklin | 10,528 | 10,828 | 11,113 | 11,350 | 11,329 | 11,590 | 11,699 | 11,874 | 12,199 | 12,371 | 12,494 | 12,203 | 12,454 |
| Oneida | 3,878 | 3,997 | 4,030 | 4,062 | 4,125 | 4,210 | 4,131 | 4,132 | 4,143 | 4,209 | 4,176 | 4,106 | 4,130 |
| Power | 8,162 | 8,224 | 8,412 | 8,404 | 7,538 | 7,468 | 7,379 | 7,373 | 7,483 | 7,753 | 7,914 | 7,684 | 7,683 |
| Total | 151,058 | 152,266 | 153,566 | 154,658 | 154,007 | 154,668 | 155,150 | 155,393 | 156,238 | 159,534 | 160,241 | 160,109 | 161,606 |