Idaho's 1st congressional district
Idaho's 1st congressional district is one of two congressional districts in the U.S. state of Idaho. It comprises the western portion of the state.
From statehood in 1890 to the 1910 election, Idaho was represented by a statewide at-large seat. Following the 1910 census, Idaho gained a second House seat; it was first contested in 1912. However, through the 1916 election, both seats were statewide at-large seats. The first election in Idaho with two congressional districts was in 1918.
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. Historically, it has been reckoned as the Boise district, as it usually included most of the state capital. The latest round of redistricting, however, saw the 1st pushed to the west, shifting almost all of its share of Boise to the 2nd district. A significant increase in population directly west of Boise over the previous decade, in western Ada and Canyon counties, was responsible for the westward shift of the boundary. However, the 1st continues to include most of Boise's suburbs. In Ada County itself, the district continues to include Meridian, Eagle, Kuna and some parts of Boise south of Interstate 84. It also includes the entire northern portion of the state, through the Panhandle.
The 1st district is currently represented by Russ Fulcher, a Republican from Boise. First elected in 2018, he defeated Democratic candidate Cristina McNeil and Libertarian candidate W. Scott Howard.
Recent results in presidential elections
| Year | Office | Results |
| 2000 | President | George W. Bush 64.61% - Al Gore 27.59% |
| 2004 | President | George W. Bush 68.92% - John Kerry 29.53% |
| 2008 | President | John McCain 60.69% - Barack Obama 35.22% |
| 2012 | President | Mitt Romney 64.9% - Barack Obama 32.2% |
| 2016 | President | Donald Trump 63.7% - Hillary Clinton 25.4% |