| Region 3 | ||||||||
| Adult IDU Clients by County | ||||||||
| Source: IDHW Client Information System | ||||||||
| 1999-2000 | 2000-2001 | 2001-2002 | 2002-2003 | 2005 | 2006 | 2007 | 2008 | |
| Adams | 1 | 2 | 2 | 2 | ||||
| Canyon | 92 | 100 | 125 | 96 | ||||
| Gem | 14 | 10 | 14 | 16 | ||||
| Owyhee | 5 | 2 | 3 | 1 | ||||
| Payette | 18 | 11 | 14 | 20 | ||||
| Washington | 7 | 6 | 7 | 2 | ||||
| Total | 137 | 131 | 165 | 137 | 193 | 301 | 341 | 381 |