 With 374,000 out of 535,000 undocumented workers working in New York City, illegal aliens have a labor force participation rate of roughly 70 percent.This percentage is higher than the labor force participation rate for native-born residents, 60 percent, or for overall foreign-born residents, 64 percent, in New York City.Undocumented workers can be found working in almost every industry in New York City performing a wide variety of tasks.