Here are five facts about the unauthorized immigrant population in the U.S.
1. There were
11.2 million unauthorized immigrants in the U.S. in 2012, a total unchanged from 2009, and currently making up 3.5% of the nation’s population. (Preliminary estimates show the population was 11.3 million in 2013.) The number of unauthorized immigrants peaked in 2007 at 12.2 million, when this group was 4% of the U.S. population.
Number of unauthorized immigrants from Mexico declines since 2007 peak.
2.
Mexicans make up about half of all unauthorized immigrants (52%), though their numbers have been declining in recent years. There were 5.9 million Mexican unauthorized immigrants living in the U.S. in 2012, down from 6.4 million in 2009, according to Pew Research Center estimates. Over the same time period, the number of unauthorized immigrants from Asia, the Caribbean, Central America and a grouping of countries in the Middle East, Africa and some other areas grew slightly (unauthorized immigrant populations from South America and Europe/Canada did not change significantly).
3.
Six states alone account for 60% of unauthorized immigrants—California, Texas, Florida, New York, New Jersey and Illinois. But the distribution of the population is changing. From 2009 to 2012, several East Coast states were among those with population increases, whereas several Western states were among those with population decreases. There were seven states overall in which the unauthorized immigrant population increased: Florida, Idaho, Maryland, Nebraska, New Jersey, Pennsylvania and Virginia. Meanwhile, there were 14 states in which the population decreased over the same time period: Alabama, Arizona, California, Colorado, Georgia, Illinois, Indiana, Kansas, Kentucky, Massachusetts, Nevada, New Mexico, New York and Oregon. Despite a decline, Nevada has the nation’s largest share (8%) of unauthorized immigrants in its state population.
4.
Unauthorized immigrants make up 5.1% of the U.S. labor force. In the U.S. labor force, there were 8.1 million unauthorized immigrants either working or looking for work in 2012. Among the states, Nevada (10%), California (9%), Texas (9%) and New Jersey (8%) had the highest shares of unauthorized immigrants in their labor forces.
5. About
7% of K-12 students had at least one unauthorized immigrant parent in 2012. Among these students, about eight-in-ten (79%) were born in the U.S. In Nevada, almost one-in-five students (18%) have at least one unauthorized immigrant parent, the largest share in the nation. Other top states on this measure are California (13%), Texas (13%) and Arizona (11%).
http://www.pewresearch.org/fact-tank/2014/11/18/5-facts-about-illegal-immigration-in-the-u-s/ 
