| Region 4 | ||||||||
| Adult IDU Clients by County | ||||||||
| Source: IDHW Client Information System | ||||||||
| 1999-2000 | 2000-2001 | 2001-2002 | 2002-2003 | 2005 | 2006 | 2007 | 2008 | |
| Ada | 162 | 148 | 164 | 113 | ||||
| Boise | 2 | 1 | 0 | 1 | ||||
| Elmore | 12 | 10 | 11 | 5 | ||||
| Valley | 4 | 1 | 2 | 5 | ||||
| Total | 180 | 160 | 177 | 124 | ||||
| Total | 180 | 160 | 177 | 124 | 114 | 215 | 379 | 502 |