census tracts
type: Concept
definition: Census tracts are small, relatively stable statistical areas that generally contain between 1,500 and 8,000 people, with an optimal population of 4,000. They belong to a hierarchical system for organizing the territory of the United States for census-taking purposes. [Source: Encyclopedia of Human Geography; Census Tracts]
broader: urban geography

urban geography
type: Concept
narrower: census tracts

concepts
type: Collection
type: ConceptGroup
member: census tracts