Census Tract
A census tract is a small geographic unit delineated for the presentation and analysis of decennial census data. Census tracts are a form of statistical geography, as opposed to geography created exclusively for legal, political or administrative purposes.
In New York City, census tracts average 4,000 residents and a land area of 90 acres. Census tracts are intended to permit meaningful analyses of small areas over time and thus have relatively permanent boundaries.
Community Districts (CDs):
Community Districts are administrative districts that are unique to New York City. Each of the city’s 59 community districts has a community board, which represents the district. These boards were created by local law in 1975 and present opportunities for active participation in the political process and provision of services.
Community districts range in size from less than 900 acres to almost 15,000 acres, and in population from a little more than 50,000 residents to more than 200,000.
County:
New York City is comprised of five counties, also known as boroughs: Bronx, Brooklyn (Kings County), Manhattan (New York County), Queens and Staten Island (Richmond County).