Net Migration
Definition
The difference between the number of people entering and leaving a geographic area over a period. Positive net migration means more people moved in than out; negative means more left.
Why It Matters
Net migration reveals which areas are gaining or losing population due to movement rather than births and deaths. It reflects economic opportunity, quality of life, cost of living, and policy attractiveness.
How It's Measured
Estimated by comparing population change to natural increase (births minus deaths). The difference is attributed to migration. Also tracked through tax return data and visa records.
Related Terms
Related Glossary Terms
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Frequently Asked Questions
The difference between the number of people entering and leaving a geographic area over a period. Positive net migration means more people moved in than out; negative means more left.
Net migration reveals which areas are gaining or losing population due to movement rather than births and deaths. It reflects economic opportunity, quality of life, cost of living, and policy attractiveness.
Estimated by comparing population change to natural increase (births minus deaths). The difference is attributed to migration. Also tracked through tax return data and visa records.
Net Migration 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.