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

| Representative | Years | State_ | Party | Lifespan |
|---|---|---|---|---|
| Clement J. Zablocki | 1949–1983 | Wisconsin | Democratic | 1912–1983 |
| Leo C. Zeferetti | 1975–1983 | New York | Democratic | 1927– |
| Herbert Zelenko | 1955–1963 | New York | Democratic | 1906–1979 |
| Bill Zeliff | 1991–1997 | New Hampshire | Republican | 1936– |
| William T. Zenor | 1897–1907 | Indiana | Democratic | 1846–1916 |
| Edward Danner Ziegler | 1899–1901 | Pennsylvania | Democratic | 1844–1931 |
| Frederick Nicholas Zihlman | 1917–1931 | Maryland | Republican | 1879–1935 |
| Dick Zimmer | 1991–1997 | New Jersey | Republican | 1944– |
| Orville Zimmerman | 1935–1948 | Missouri | Democratic | 1880–1948 |
| Roger H. Zion | 1967–1975 | Indiana | Republican | 1921– |
| Marion Zioncheck | 1933–1936 | Washington | Democratic | 1901–1936 |
| Felix Zollicoffer | 1853–1855 | Tennessee | Whig | 1812–1862 |
| Felix Zollicoffer | 1855–1859 | Tennessee | American | 1812–1862 |
| Ed Zschau | 1983–1987 | California | Republican | 1940– |
| John M. Zwach | 1967–1975 | Minnesota | Republican | 1907–1990 |