6. Las Vegas-Henderson-Paradise, NV
Total number of illegal immigrants: 170,000
Percentage of total population comprising of illegal immigrants: 8.0%
Insider Monkey score: 23
The number 6 on our list of cities with most illegal immigrants in America is Las Vegas that is another place where anti-immigration policies are being strictly enforced, as evidenced by the 87 immigrants who were arrested just last year in raids authorized by Obama, of which many had entered the country illegally.