Census Tract
Definition
A small, relatively permanent geographic area defined by the Census Bureau for statistical purposes. Census tracts generally contain 1,200 to 8,000 people and are designed to be homogeneous with respect to population characteristics.
Why It Matters
Census tracts are the most commonly used small-area geography for demographic analysis. They enable neighborhood-level comparisons of income, education, housing, and racial composition.
How It's Measured
Defined by local committees in partnership with the Census Bureau. Tracts follow visible features (roads, rivers) and are updated each decade.
Related Terms
Related Glossary Terms
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Frequently Asked Questions
A small, relatively permanent geographic area defined by the Census Bureau for statistical purposes. Census tracts generally contain 1,200 to 8,000 people and are designed to be homogeneous with respect to population characteristics.
Census tracts are the most commonly used small-area geography for demographic analysis. They enable neighborhood-level comparisons of income, education, housing, and racial composition.
Defined by local committees in partnership with the Census Bureau. Tracts follow visible features (roads, rivers) and are updated each decade.
Census Tract is one of the U.S. population demographics concepts that recurs across this site. The definition above is the technical answer; the paragraphs below add the practical context for how the concept connects to the the U.S. Census Bureau ACS and decennial files data behind every per-entity page on the site.
In the the U.S. Census Bureau ACS and decennial files data, this concept shapes one or more of the fields that drive the per-entity grades and rankings on this site. The methodology page describes which fields feed into which output; this glossary entry documents the underlying term.
Source: U.S. Census Bureau ACS, 2026.