District of Columbia

Mayors of Washington City
1802-1812   Robert Brent
1812-1813   Daniel Rapine
1813-1817   James H. Blake
1817-1819   Benjamin G. Orr
1819-1822   Samuel N. Smallwood
1822-1824   Thomas Carbery
1824-1824   Samuel N. Smallwood
1824-1827   Roger C. Weightman
1827-1830   Joseph Gales Jr.
1830-1834   John P. Van Ness
1834-1836   William A. Bradley
1836-1840   Peter Force
1840-1850   William Winston Seaton
1850-1852   Walter Lenox
1852-1854   John W. Maury
1854-1856   John Thomas Towers
1856-1858   William B. Magruder
1858-1861   James G. Berret
1861-1868   Richard Wallach
1868-1870   Sayles J. Bowen
1870-1871   Matthew Gault Emery

Governors of the District of Columbia
1871-1873   Henry Cooke
1873-1874   Alexander Shepherd

Presidents, Board of Commissioners
1874-1878  William Dennison
1878-1879  Seth Ledyard Phelps
1879-1882  Josiah Dent
1882-1883  Joseph Rodman West
1883-1886  James Barker Edmonds
1886-1889  William Benning Webb
1889-1893  John Watkinson Douglass
1893-1898  John Wesley Ross
1898-1900  John Brewer Wright
1898-1900  Henry Brown Floyd Macfarland
1910-1913  Cuno Hugo Rudolph
1913-1917  Oliver Peck Newman
1917-1920  Louis Brownlow
1920-1920  Charles Willauer Kutz
1920-1926  Cuno Hugo Rudolph
1926-1930  Proctor L. Dougherty
1930-1933  Luther Halsey Reichelderfer
1933-1941  Melvin Colvin Hazen
1941-1952  John Russell Young
1952-1953  F. Joseph Donohue
1953-1956  Samuel Spencer
1956-1961  Robert E. McLaughlin
1961-1967  Walter Nathan Tobriner
1967-1975  Walter Washington

Mayors under Home Rule
1975-1979  Walter Washington
1979-1991  Marion S. Barry
1991-1995  Sharon Pratt (Dixon) Kelly
1995-1999  Marion S. Barry
1999 now   Anthony A. Williams

Reference
U-S-history.com, Chief Executives of Washington, D.C.