U.S. Census Bureau | http://www.census.gov
Beginning with the 2000 census, CUGIR adopted a policy of only providing decadal updates to census data sets. These data are derived from the US Census bureau's TIGER/Line files, and the Census Bureau releases periodic updates in between decadal censuses. The significance of these updates varies, and it is the user's responsibility to determine whether they should obtain updated data from the Census Bureau.
Note also that the Census began distributing TIGER/Line data as shapefiles on March 31, 2008.
NY counties data series
62 mapsheets available for data theme Census Tracts 2000