List of former members of the United States House of Representatives (U) Number of years/terms representative/delegate has served Number of years/terms representative/delegate has served

| Representative | Years | State_ | Party | Lifespan |
|---|---|---|---|---|
| Mark Udall | 1999–2009 | Colorado | Democratic | 1950– |
| Mo Udall | 1961–1991 | Arizona | Democratic | 1922–1998 |
| Stewart Udall | 1955–1961 | Arizona | Democratic | 1920–2010 |
| Tom Udall | 1999–2009 | New Mexico | Democratic | 1948– |
| Daniel Udree | 1813–1815 1820–1821 1822–1825 | Pennsylvania | Democratic-Republican | 1751–1828 |
| Al Ullman | 1957–1981 | Oregon | Democratic | 1914–1986 |
| William B. Umstead | 1933–1939 | North Carolina | Democratic | 1895–1954 |
| Charles L. Underhill | 1921–1933 | Massachusetts | Republican | 1867–1946 |
| Edwin S. Underhill | 1911–1915 | New York | Democratic | 1861–1929 |
| John Q. Underhill | 1899–1901 | New York | Democratic | 1848–1907 |
| Walter Underhill | 1849–1851 | New York | Whig | 1795–1866 |
| John W. H. Underwood | 1859–1861 | Georgia | Democratic | 1816–1888 |
| Joseph R. Underwood | 1835–1843 | Kentucky | Whig | 1791–1876 |
| Mell G. Underwood | 1923–1936 | Ohio | Democratic | 1892–1972 |