The U.S. is a nation of immigrants. But unauthorized immigrants have become a source of political debate, and Congress and President Obama disagree over the best course of action to address issues such as deportations, legal status, education and benefits. For years, the Pew Research Center has estimated the size of the unauthorized immigrant population and surveyed the U.S. public about immigration.

HispanicDecember 16, 2016

U.S. immigrant deportations fall to lowest level since 2007

The Obama administration deported 333,341 unauthorized immigrants in the 2015 fiscal year, a decline of about 81,000 (or 20%) from the prior year.

HispanicDecember 15, 2016

International migration: Key findings from the U.S., Europe and the world

Millions of people around the world have migrated to the U.S. and other countries in recent years – some voluntarily, others to flee political turmoil, persecution or war.

HispanicNovember 29, 2016

Trump voters want to build the wall, but are more divided on other immigration questions

Though many Trump supporters say illegal immigration is a serious problem in the U.S. and want to build the wall, they are more divided on other questions.

Fact TankNovember 17, 2016

Children of unauthorized immigrants represent rising share of K-12 students

About 3.9 million kindergarten through 12th-grade students in U.S. public and private schools in 2014 were children of unauthorized immigrants.

HispanicNovember 3, 2016

Estimated unauthorized immigrant population, by state, 2014

California has by far the largest number of unauthorized immigrants, about 2.3 million in 2014.

HispanicNovember 3, 2016

Unauthorized immigrant population trends for states, birth countries and regions

Explore U.S. unauthorized immigrant population trends for states of residence, as well as for international regions and largest countries of birth, based on Pew Research Center estimates.

HispanicNovember 3, 2016

Size of U.S. Unauthorized Immigrant Workforce Stable After the Great Recession

There were 8 million unauthorized immigrants in the U.S. working or looking for work in 2014, making up 5% of the civilian labor force, according to new Pew Research Center estimates using government data.

Fact TankOctober 26, 2016

Number of babies born to unauthorized immigrants in U.S. continues to decline

About 275,000 babies were born to unauthorized-immigrant parents in 2014, a decline from 330,000 in 2009.

Fact TankSeptember 21, 2016

Unauthorized immigrant population stable for half a decade

The unauthorized immigrant population in the U.S. – 11.1 million in 2014 – has remained essentially stable since 2009 after nearly two decades of changes.

Fact TankSeptember 20, 2016

Measuring illegal immigration: How Pew Research Center counts unauthorized immigrants in the U.S.

Jeffrey S. Passel, senior demographer, on the research techniques used to derive the unauthorized immigrant population estimate in the U.S. and the challenges involved.