Idaho Territory's at-large congressional district

Idaho Territory, as originally organized, in 1863

Idaho Territory in 1864

Idaho Territory (yellow) in 1868

Idaho Territory's At-large congressional district is an obsolete congressional district that encompassed the area of the Idaho Territory, which was originally created from parts of the Washington Territory and Dakota Territory in 1863. In 1864, parts of the territory were ceded back to the Dakota Territory and another part was reorganized into the Montana Territory. The boundaries of the territory were changed again in 1868 when the Wyoming Territory was created.

After Idaho's admission to the Union as the 43rd state by act of Congress on July 3, 1890, this district was dissolved and replaced by Idaho's At-large congressional district.

List of delegates

On March 3, 1863, an act of Congress gave Idaho Territory the authority to elect a Congressional delegate, although the first delegate did not take his seat until 1864.

Delegate	Party	Years	District home	Notes
District created		February 1, 1864
William H. Wallace	Republican	February 1, 1864 – March 3, 1865	Lewiston
Edward D. Holbrook	Democratic	March 4, 1865 – March 3, 1869	Idaho City
Jacob K. Shafer	Democratic	March 4, 1869 – March 3, 1871	Idaho City
75px Samuel A. Merritt	Democratic	March 4, 1871 – March 3, 1873	Idaho City
John Hailey	Democratic	March 4, 1873 – March 3, 1875	Boise City
Thomas W. Bennett	Independent	March 4, 1875 – June 23, 1876	Boise City	Lost contested election
75px Stephen S. Fenn	Democratic	June 23, 1876 – March 3, 1879	Mount Idaho	Won contested election
George Ainslie	Democratic	March 4, 1879 – March 3, 1883	Idaho City
75px Theodore F. Singiser	Republican	March 4, 1883 – March 3, 1885	Boise City
John Hailey	Democratic	March 4, 1885 – March 3, 1887	Boise City
Fred Dubois	Republican	March 4, 1887 – July 3, 1890	Blackfoot
District eliminated		July 3, 1890