urban v rural

Does anyone know how urban v rural is defined for a census tract ?  There is the "urban area" geography.  Are census tracts within an "urban area" defined as "urban?"  The definition of urban v rural may depend on the application.  For example the Centers for Disease Control has this distinction but I don't know if they use the US Census definition or something else.  Also is there a file with the fips codes for urban census tracts ? Dave Dorer

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