License plates in the state of Illinois have been coming from one manufacturer for decades. Starting in 1983 Macon Resources has made nearly every license plate for drivers across the state. This week they celebrated their 40th anniversary and Secretary of State Alexi Giannoulis toured the facility that employs individuals with developmental disabilities and turns out about 24,000 plates a day.

Illinois is just one of two states that don’t make license plates in prisons.