1930. This polygon layer represents the Census Tract (1930?) in Washington, DC 1930.
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1930. This polygon layer represents the Census Tract (1940) in Washington, DC 1940.
1930. This polygon layer represents the Census Tract (1950) in Washington, DC 1950.
1930. This polygon layer represents the Census Tract (1960) in Washington, DC 1960.
1930. This polygon layer represents the Census Tract (1970) in Washington, DC 1970.
1930. This polygon layer represents the Census Tract (1980) in Washington, DC 1980.
1930. This polygon layer represents the Census Tract in Washington, DC 1990.