State Farm Insurance, a major insurer headquartered in Illinois, said the legislation could present challenges for insurance companies in assessing the driving record of illegal immigrants, but the company would implement the law.
"Just because you have a driver's license of any kind doesn't mean you'll get insurance," said spokeswoman Missy Dundov. "We have to consider all the information available."
The Illinois Safer Families Coalition ran ads opposing the measure. Coalition spokesman Bill Kelly noted that a truck driver who bribed a state official to illegally obtain a driver's license was involved in a 1994 crash that killed six people.
"I'm afraid that this bill, this poorly thought-through bill, is going to result in similar tragedies," Kelly said.
The scandal resulting from the 1994 accident led to the conviction and jailing of former Illinois Republican Governor George Ryan.
According to the 2010 U.S. Census, Illinois was home to 2 million Latinos, or nearly 16 percent of the population.
(Additional reporting by Mary Wisniewski; Editing by Greg McCune and David Gregorio)