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Definition

A census tract is a statistical subdivision of a county drawn by the Census Bureau so population data can be reported for small areas. It is a counting unit rather than a legal or administrative one: nothing is zoned, taxed or governed by tract. Federal programs borrow the geography because the data already exists at that scale.

How to read it
How to read it
  • A tract is a container for people, not a neighborhood. Its lines answer to the Census Bureau's counting, never to how anyone here describes where they live.
  • Two buildings on one block can sit in different tracts. The boundary runs down a street and nothing on either side announces it.
  • Every tract-level program inherits that geography, so a designation map is only ever as fine as the tract underneath it.
  • A folio maps to a tract in minutes and the lookup is free. Assuming the tract from the neighborhood name is where the error enters.
An example
An example

How the Census Bureau sizes a tract.

Optimum population per tract4,000
Minimum before tracts are merged1,200
Maximum before a tract is split8,000
Boundary vintage behind the 2027 list2020
Miami-Dade tracts on the eligible list245

A tract is sized by headcount, so in a dense city it can be a few blocks. The map is finer than the neighborhood names people actually use.

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