Below are some great sources of data and information about undocumented immigrants in the US:
- 5 facts about illegal immigration in the U.S.
- 7 Charts that Explain the Undocumented Immigration Population in the USA
- MPI's Frequently Requested Statistics on Immigrants and Immigration in the United States (from 2015)
- MPI's Undocumented Immigrant Population Profiles
- Fact-checking Donald Trump and his claim that there are 30 million undocumented immigrants
MPI is a think tank that does not take a position on immigration legislation. Most sources suggest that the undocumented immigrant population is about 11-11.3 million. Meanwhile, the total population of the USA is about 318.9 million so undocumented immigrants make up about 3.5% of the nation's population.