Idaho's 18th legislative district is one of 35 districts of the Idaho Legislature. It is currently represented by Janie Ward-Engelking, Democrat of Boise,[1] Ilana Rubel, Democrat of Boise, and Brooke Green, Democrat of Boise.[2]
District 18 currently consists of a portion of Ada County.[3]
| Legislature | Session | Senate | House Seat A | House Seat B |
| 62nd (2012 - 2014) | 1st | Branden Durst (D) | Janie Ward-Engelking (D) | Phylis King (D) |
| 2nd | Janie Ward-Engelking (D) | Ilana Rubel (D) | ||
| 63rd (2014 - 2016) | 1st | |||
| 2nd | ||||
| 64th (2016 - 2018) | 1st | |||
| 2nd | ||||
| 65th (2018 - 2020) | 1st | Brooke Green (D) | ||
| 2nd | ||||
| 66th (2020 - 2022) | 1st | |||
| 2nd |
From 2002 to 2012, District 18 consisted of a portion of Ada County.
| Legislature | Session | Senate | House Seat A | House Seat B |
| 57th (2002 - 2004) | 1st | Sheila Sorensen (R) | Debbie Field (R) | Julie Ellsworth (R) |
| 2nd | ||||
| 58th (2004 - 2006) | 1st | Kate Kelly (D) | ||
| 2nd | ||||
| 59th (2006 - 2008) | 1st | Branden Durst (D) | Phylis King (D) | |
| 2nd | ||||
| 60th (2008 - 2010) | 1st | |||
| 2nd | ||||
| 61st (2010 - 2012) | 1st | Mitch Toryanski (R) | Julie Ellsworth (R) | |
| 2nd |
From 1992 to 2002, District 18 consisted of a portion of Ada County.
| Legislature | Session | Senate | House Seat A | House Seat B |
| 51st (1992 - 1994) | 1st | Roger Madsen (R) | Bill Sali (R) | Fred Tilman (R) |
| 2nd | ||||
| 52nd (1994 - 1996) | 1st | Jim Risch (R) | ||
| 2nd | ||||
| 53rd (1996 - 1998) | 1st | |||
| 2nd | ||||
| 54th (1998 - 2000) | 1st | |||
| 2nd | ||||
| 55th (2000 - 2002) | 1st | |||
| 2nd |