Federal law requires the U.S. Census to count all residents of a state, regardless of immigration status. That long-standing rule means states with larger populations of illegal aliens can see indirect effects on congressional representation and certain federal funding formulas.

Constitutional Basis for the Census Count

The governing language comes from the Constitution itself. Article I, Section 2 requires an “actual Enumeration” of the population every ten years. The 14th Amendment later clarified the basis for representation, stating that seats in the U.S. House of Representatives must be apportioned among the states according to their populations, “counting the whole number of persons in each State.”

The key phrase is “whole number of persons.” The text does not limit the count to citizens or lawful residents. As a result, the Census Bureau counts everyone whose “usual residence” is in the United States at the time of the census. In census methodology, usual residence means the place where a person lives and sleeps most of the time.

That population count includes U.S. citizens, lawful permanent residents, temporary visa holders, and illegal aliens. It excludes tourists and short-term visitors. Immigration status is not asked on the census form used for apportionment.

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Impact on Congressional Representation

Once the census is completed, the population totals determine how the 435 seats in the House of Representatives are divided among the states. Because each state receives representation based on total population, a larger resident population—regardless of citizenship status—can increase a state’s share of House seats and Electoral College votes.

The issue has periodically generated legal and political debate. In 2020, the Trump administration attempted to exclude illegal aliens from the apportionment count. The administration issued a memorandum directing the Department of Commerce to provide numbers that could be used to remove illegal aliens from the population totals used for congressional apportionment.

The matter reached the U.S. Supreme Court in Trump v. New York (2020). The Court did not ultimately decide whether excluding illegal aliens would be constitutional. Instead, it dismissed the case as premature because the administration had not produced a final apportionment calculation before the change in administrations. The long-standing practice of counting all residents therefore remained in place.

How Census Numbers Affect Federal Funding

While the census count determines congressional representation, it also affects the distribution of federal funds to states. Hundreds of federal programs use population-based formulas derived from census data or the American Community Survey. These programs include transportation funding, community development grants, public health funding, and various education programs.

Many formulas use measures such as total population, population under poverty thresholds, or population under age 18. Because those figures come from census data that count all residents, a larger resident population can increase the amount of federal funding allocated to a state.

However, the existence of population-based funding formulas does not mean illegal aliens are personally eligible for most federal benefits. Federal law places restrictions on benefit eligibility based on immigration status.

Federal Benefit Eligibility Rules

The key statutory framework is the Personal Responsibility and Work Opportunity Reconciliation Act of 1996. Under that law, most federal public benefits are limited to U.S. citizens and “qualified aliens,” a term defined in federal immigration law. Qualified aliens include categories such as lawful permanent residents, refugees, and certain humanitarian entrants. Illegal aliens are generally barred from most federal public benefits, though exceptions exist for emergency medical services and certain public health measures.

As a result, federal programs operate under two separate legal structures. Population counts used for representation and funding formulas include all residents, while eligibility for individual benefits is restricted by immigration status.

Legal and Policy Debate

Some policymakers have argued that apportionment and funding should instead be based on the number of citizens or lawful residents in each state. Others maintain that representation should reflect the total number of people living under a state’s laws and using its infrastructure and services.

Changing the current system would likely require either a new interpretation of the 14th Amendment or a constitutional amendment. Because the amendment specifies representation based on the “whole number of persons,” many constitutional scholars argue that excluding illegal aliens from the apportionment base would face significant legal challenges.

Another practical issue is measurement. The federal government does not maintain a direct census of illegal aliens by state. Estimates of the illegal alien population typically come from statistical modeling conducted by the Department of Homeland Security, academic researchers, and organizations such as the Pew Research Center. Those estimates rely on survey data and demographic analysis rather than direct enumeration.

Why Small Population Changes Matter

The impact of population counts on congressional representation can be significant even with small numerical changes. Apportionment uses a formula known as the “method of equal proportions,” which distributes House seats based on relative population sizes among states. In close cases, very small population differences can determine whether a state gains or loses a seat.

Following the 2020 census, for example, New York missed retaining one of its House seats by just 89 residents under the apportionment formula.

The Current Legal Reality

Because representation, Electoral College votes, and federal funding formulas are all tied in various ways to census data, the question of how populations are counted continues to draw attention from lawmakers and policymakers.

For now, federal law and census practice remain clear: the census counts the total resident population of each state, and congressional representation is apportioned based on that count of persons, not citizenship status.

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Dave Soulia | FYIVT

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