According to Wikipedia, A census tract aka census area or census district or meshblock is a geographic region defined for the purpose of taking a census. Sometimes these coincide with the limits of cities, towns or other administrative areas and several tracts commonly exist within a county.
The US Census Tracts can be downloaded from the United States Census Bureau. It is provided in TIGER/Line format. TIGER stands for "Topologically Integrated Geographic Encoding and Referencing", or TIGER, or TIGER/Line is a format used by the United States Census Bureau to describe land attributes such as roads, buildings, rivers, and lakes, as well as areas such as census tracts.
This map layer can then be joined with any tabular record for further analysis.
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