6. Mississippi
Illegal immigrants per 10,000 people: 836
More than two-thirds of the illegal immigrants in Mississippi, the next in line on our list of states with the fewest illegal immigrants in America are Mexicans, and nearly 75% of the population has been in the US for more than 5 years, with 10% having been present for more than two decades. The demographic of the undocumented population is overwhelmingly male, with only 36% being females. A quarter of the population has managed at least a high school diploma.