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 members representing the district 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 Congress Electoral history District created February 1, 1864 William H. Wallace Union February 1, 1864 –March 3, 1865 Elected October 31, 1863 in anticipation of territorial status.Retired. Edward D. Holbrook Democratic March 4, 1865 –March 3, 1869 Elected in 1864.Re-elected in 1866.Retired. Jacob K. Shafer Democratic March 4, 1869 –March 3, 1871 Elected in 1868.Lost renomination. Samuel A. Merritt Democratic March 4, 1871 –March 3, 1873 Elected in 1870.Lost renomination. John Hailey Democratic March 4, 1873 –March 3, 1875 Elected in 1872.Retired. Thomas W. Bennett Independent March 4, 1875 –June 23, 1876 Elected in 1874.Lost election contest. Stephen S. Fenn Democratic June 23, 1876 –March 3, 1879 Won election contest.Re-elected in 1876.Retired. George Ainslie Democratic March 4, 1879 –March 3, 1883 Elected in 1878.Re-elected in 1880.Lost re-election. Theodore F. Singiser Republican March 4, 1883 –March 3, 1885 Elected in 1882.Lost re-election. John Hailey Democratic March 4, 1885 –March 3, 1887 Elected in 1884.Lost re-election. Fred Dubois Republican March 4, 1887 –July 3, 1890 Elected in 1886.Re-elected in 1888.District eliminated upon statehood. District eliminated July 3, 1890

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