| Region 4 | ||||||||||
| % Growth/Reduction in Population | ||||||||||
| Source: Population Estimates Program, Population Division, U.S. Census Bureau | ||||||||||
| Last updated: 3/10/09 | ||||||||||
| 1997 | 1998 | 1999 | 2000 | 2001 | 2002 | 2003 | 2004 | 2005 | 2006 | |
| Ada | 2.56 | 3.13 | 2.74 | 5.82 | 3.66 | 2.30 | 1.68 | 2.21 | 3.54 | 3.99 |
| Boise | 2.80 | 1.56 | 3.58 | 20.37 | 4.86 | 0.79 | 2.34 | 1.71 | 2.30 | 1.39 |
| Elmore | 4.32 | 2.69 | 1.05 | 12.03 | 0.09 | 1.10 | -2.11 | 0.02 | -0.85 | 1.85 |
| Valley | 1.47 | -0.82 | -1.93 | -2.71 | 0.84 | -2.52 | 2.80 | 2.85 | 4.34 | 5.70 |
| Total | 2.68 | 2.96 | 2.51 | 6.43 | 3.33 | 2.07 | 1.42 | 2.05 | 3.21 | 3.57 |