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Citizenship and Immigration Statistics: U.S.: Undocumented Immigrants

Provides a guide to obtaining statistics on citizenship and immigration for the U.S.

Undocumented Immigrants in the US

The Department of Homeland Security (DHS) is responsible for the apprehension or arrest, detention, return, and removal of aliens, or undocumented immigrants, from the US. Aliens may be removable from the US for violations including illegally entering the country, failing to abide by the terms and conditions of admission, or committing crimes. Primary responsibility for the enforcement of immigration law within DHS rests with US Customs and Border Protection (CBP), US Immigration and Customs Enforcement (ICE) and U.S. Citizenship and Immigration Services (USCIS). CBP is generally responsible for immigration enforcement at and between the ports of entry, and ICE is generally responsible for interior enforcement, and detention and removal operations. USCIS is generally responsible for the administration of immigration and naturalization functions.

Undocumented Immigrants in the US: Sample Statistics

While the Department of Homeland Security is responsible for enforcing immigration law in the US, the US Census Bureau also collects data on undocumented immigrants, primarily via the American Community Survey (ACS). This survey includes a question on citizenship status. Responses to this question are used to divide the foreign-born population into naturalized citizens and noncitizens.

Clink on the links below to view DataSheets comprising statistical abstracts complete with infographics of statistics on the noncitizen foreign-born population in the US in Data Planet Statistical Statistical Datasets. Explore other statistics on citizenship as well as relationships between these statistics and other indicators in the vast Data Planet repository. 

Foreign-born males in the US under age 18 who are not US citizens

Foreign-born males in the US over age 18 who are not US citizens

Foreign-born females in the US under age 18 who are not US citizens

Foreign-born females in the US over age 18 who are not US citizens

Alien removals by country of nationality

Aliens deemed inadmissable by country of nationality


Exploring Statistics on Undocumented Immigrants in Statistical Datasets

Use Data Planet Statistical Datasets to compare and contrast statistics on the noncitizen foreign-born population in the US. The powerful functionality of the plaform allows you to select multiple indicators, revealing interesting potential areas for further research. To select multiple indicators, hold down the control (Ctrl) key when clicking on a second (or third) item in the criteria panel. For more information on Data Planet Statistical Datasets, click here.

This chart compares the count of population of noncitizens over age 18 who Speak English very well or less than very well.


For example, the chart below compares the median age of the native male population against that of the noncitizen male population in 10 states:


The ranking below shows the top 10 states with the highest noncitizen population:

The pie chart below shows the distribution of noncitizens without health insurance coverage across California counties:


The ranking below compares means of transportation to work by noncitizens in New York:


And much, much, more! Browse the listing of American Community Survey indicators to explore more detailed information on how socioeconomic characteristics of the US population vary by citizenship status.

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