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Illegal Immigration Statistics: Home

This is a guide to assist users in finding reliable information on undocumented immigrants and workers in the U.S.--population, employment, taxes paid, etc.

Web Sites

Illegal Immigration Statistics

Disclaimer:  Reliable statistics on illegal immigration are much more difficult to obtain than those on legal immigration.  For obvious reasons, people who enter the country illegally, or who overstay work visas, or who feel that their situation in this country is precarious for any reason, will not be volunteering information on who they are, where they are, or how much money they are making doing various jobs.  So much of the information offered in the resources below follows a certain amount of estimation and assumption, i.e. “educated guesses.”

The ways in which the web sites on this page came up with their statistical information vary, and some of the sites are more transparent about their methodology than others. 

Finally, these sites come from all over the political spectrum, from conservative to liberal to many who claim to be non-partisan.  It is up to the user of this LibGuide to use critical thinking skills in the analysis and application of the data offered here.  In an attempt to avoid favoritism, they are simply listed here in alphabetical order.

**Searching Tip:  When searching in this subject area, illegal immigrants may also be termed undocumented immigrants/workers.  Immigrants are also often referred to as aliens in these resources.


American Fact Finder US Census:

Center for Immigration Studies: The Costs of immigration

Cityscape: A Journal of Policy Development and Research (Public Policy Debate and Immigration):

Economic impact of illegal immigrants in the United States  (Wikipedia):

The Fiscal Burden of Illegal Immigration on US. Taxpayers 2017 (report)—FAIR (Federation for American Immigration Reform):

Frequently Requested Statistics on Immigrants and Immigration in the United States  (Migration Policy Institute):

Illegal Aliens Taking U.S. Jobs (FAIR—Federation for American Immigration Reform):

Immigration Data Portal (Center for Immigration Studies):

Immigrant Workers in the U.S. Labor Force (Brookings):

The Integration of Immigrants into American Society (2017)

Migration Data Hub (Migration Policy Institute):

Ohio Profile

Organisation for Economic Co-operation and Development:

Population Estimates, 2007  Department of Homeland Security:

Research Guide (from the Migration Policy Institute):

Statistical Abstracts:

Undocumented Immigrants and the DACA-eligible Population—Employment, Taxes Paid, etc.:

Undocumented immigrants pay millions of dollars in state taxes — even in the reddest states:

UA Statistical Databases

Subject Librarian

Mike Tosko's picture
Mike Tosko

Bierce Library, 178C