Please understand that geographies aka census tracts are not unique numbers by themselves. To have a truly unique tract number you should also have the state and county components along with the tract number. A unique census tract number has 11 characters and 3 components, State (2 characters), County (3 characters)and tract (6 characters). So tract 1234.01 in State 08 and County 01 really is 080011234.01.
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