Montana Territory's at-large congressional district is an obsolete congressional district that encompassed the area of the Montana Territory, which was split off from the Idaho Territory in 1864. After Montana's admission to the Union as the 41st state by act of Congress on November 8, 1889, this district was dissolved and replaced by Montana's at-large congressional district.

List of delegates representing the district On May 26, 1864, an act of Congress gave Montana Territory the authority to elect a congressional delegate,Section 13 of Chapter 95, though the first delegate did not take his seat until 1865.

Delegate Party Years Congress Electoral history Vacant May 26, 1864 –January 6, 1865 Samuel McLean Democratic January 6, 1865 –March 3, 1867 Elected in 1864.Re-elected in 1865.Retired. James M. Cavanaugh Democratic March 4, 1867 –March 3, 1871 Elected in 1866.Re-elected in 1868.Lost renomination. William H. Clagett Republican March 4, 1871 –March 3, 1873 Elected in 1871.Lost re-election. Martin Maginnis Democratic March 4, 1873 –March 3, 1885 Elected in 1872.Re-elected in 1874.Re-elected in 1876.Re-elected in 1878.Re-elected in 1880.Re-elected in 1882.Retired. Joseph K. Toole Democratic March 4, 1885 –March 3, 1889 Elected in 1884.Re-elected in 1886.Retired. Thomas H. Carter Republican March 4, 1889 –November 8, 1889 Elected in 1888.Position eliminated upon statehood.

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