Here's the list of American laureates, earliest to latest, as listed on the Library of Congress website.
Aside from Rita Dove, with how many are you familiar?
Joseph Auslander, 1937-1941
Allen Tate, 1943-1944
Robert Penn Warren, 1944-1945
Louise Bogan, 1945-1946
Karl Shapiro, 1946-1947
Robert Lowell, 1947-1948
Leonie Adams, 1948-1949
Elizabeth Bishop, 1949-1950
Conrad Aiken, 1950-1952 First to serve two terms
William Carlos Williams, (Appointed in 1952 but did not serve.)
Randall Jarrell, 1956-1958
Robert Frost, 1958-1959
Richard Eberhart, 1959-1961
Louis Untermeyer, 1961-1963
Howard Nemerov, 1963-1964
Reed Whittemore, 1964-1965
Stephen Spender, 1965-1966
James Dickey, 1966-1968
William Jay Smith, 1968-1970
William Stafford, 1970-1971
Josephine Jacobsen, 1971-1973
Daniel Hoffman, 1973-1974
Stanley Kunitz, 1974-1976
Robert Hayden, 1976-1978
William Meredith, 1978-1980
Maxine Kumin, 1981-1982
Anthony Hecht, 1982-1984
Robert Fitzgerald, 1984-1985
Reed Whittemore, 1984-1985
Gwendolyn Brooks, 1985-1986
Robert Penn Warren, 1986-1987
Richard Wilbur, 1987-1988
Howard Nemerov, 1988-1990
Mark Strand, 1990-1991
Joseph Brodsky, 1991-1992
Mona Van Duyn, 1992-1993
Rita Dove, 1993-1995
Robert Hass, 1995-1997
Robert Pinsky, 1997-2000
Stanley Kunitz, 2000-2001
Billy Collins, 2001-2003
Louise Glück, 2003-2004
Ted Kooser, 2004-2006
Here's the Library of Congress website where I got this info today: http://www.loc.gov/today/pr/2006/06-131.html