| Idaho State | |||||||||||||
| 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 | |
| Region 1 | 162136 | 166304 | 169414 | 173575 | 178333 | 182140 | 184327 | 188838 | 194406 | 201570 | 206140 | 208445 | 211870 |
| Region 2 | 97711 | 98464 | 97858 | 97754 | 100533 | 99163 | 99799 | 100348 | 100754 | 100465 | 101195 | 102388 | 102099 |
| Region 3 | 169903 | 175139 | 179941 | 184924 | 191297 | 200383 | 205719 | 213465 | 220096 | 227825 | 237246 | 243156 | 248000 |
| Region 4 | 296643 | 304800 | 314113 | 322198 | 344355 | 356221 | 363761 | 369002 | 376733 | 389228 | 403626 | 418778 | 426283 |
| Region 5 | 154710 | 156365 | 157188 | 158710 | 162397 | 163573 | 165289 | 167444 | 168624 | 170617 | 173626 | 174157 | 176400 |
| Region 6 | 151058 | 152266 | 153566 | 154658 | 154007 | 154668 | 155150 | 155393 | 156238 | 159534 | 160241 | 160109 | 161606 |
| Region 7 | 155842 | 157300 | 158843 | 159881 | 163031 | 164678 | 167086 | 171842 | 176411 | 179857 | 184391 | 192469 | 197558 |
| State Totals | 1188003 | 1210638 | 1230923 | 1251700 | 1293953 | 1320826 | 1341131 | 1366332 | 1393262 | 1429096 | 1468471 | 1499402 | 1523816 |