24. Denver-Aurora-Lakewood, CO
Total number of illegal immigrants: 130,000
Percentage of total population comprising of illegal immigrants: 4.7%
Insider Monkey score: 3.5
The illegal population of Denver is so significant, a crackdown on such undocumented people is actually significantly affecting the restaurant businesses, where around 20% of the workers are illegal immigrants.
Arina P Habich / Shutterstock.com
