The 1st district is currently represented by Russ Fulcher, a Republican from Meridian, who was first elected in 2018, and re-elected in 2020 and 2022.

From statehood in 1890 to the 1910 election, Idaho was represented by a statewide at-large seat.

The 2012 election cycle saw the district remain largely in the shape it has had since the 1950s, encompassing the western third of the state.

The 2020 redistricting cycle, however, saw the 1st pushed to the west, shifting almost all of its share of Boise to the 2nd district.

In Ada County itself, the district continues to include Meridian, Eagle, Kuna, and some parts of Boise, south of Interstate 84.