This polygon layer is a subset of the Census TIGER county file, re-projected to local state plane. The content of this layer has not been modified from its original version present in the US Census TIGER Line Shapesfiles, and contains official borough boundaries.The unique ID is geoid; the FIPS state-county code. This layer was created as part of the NYC Geodatabase (NYC GDB) project, a resource designed for basic geographic analysis and thematic mapping within the five boroughs of New York City.