(1837-1911) was a U.S. Representative born in Waterboro on March 17, 1837. He attended the common schools, Whitestown Seminary, Whitestown, New York, and was graduated from Bowdoin College in 1860.
Allen studied law at Columbia Law School, Washington, D.C., was admitted to the bar of York County in 1866 but never practiced. He served as a clerk in the United States Treasury Department 1867-1870, was elected clerk of the courts for York County in 1870, having been reelected three times and served until January 1, 1883.
A member of the Maine House of Representatives in 1886 and 1887 Allen was private secretary to Speaker Thomas B. Reed in Fifty-first, Fifty-fourth, and Fifty-fifth Congresses. He was a delegate at large to the Republican National Convention at St. Louis in 1896. Allen was elected as a Republican to the Fifty-sixth Congress to fill the vacancy caused by the resignation of Speaker Reed. He was reelected to the Fifty-seventh and to the four succeeding Congresses, serving from November 6, 1899, until his death in Washington, D.C. on February 20, 1911, with interment in Evergreen Cemetery in Alfred.
United States. Congress (62d, 1st session: 1911-1912). Amos L. Allen (late a representative from Maine) Memorial addresses. Delivered in the House of representatives of the United States, Sixty-second Congress, first session. Proceedings in the House, June 11, 1911. Proceedings in the Senate, February 21, 1911. Comp. under the direction of the Joint committee on printing. Publisher Washington : [Govt. print. off.], 1913.