Automotive OEM Manufacturing Companies in Illinois

Illinois has approximately 13,000 manufacturing establishments and 570,000 manufacturing employees. Illinois is a top-five manufacturing state, with Chicago as a metal fabrication and food processing center, Peoria as Caterpillar's headquarters, and a vast network of industrial suppliers.

Illinois contributes to the national automotive oem manufacturing landscape. Automotive OEM manufacturing includes vehicle assembly plants and major component facilities operated by automakers and their direct suppliers. The US has over 40 light vehicle assembly plants operated by companies including GM, Ford, Stellantis, Toyota, Honda, BMW, Mercedes-Benz, Hyundai, and Tesla.

Vehicle Assembly Plants: Final assembly facilities that build complete vehicles, operated by domestic and foreign automakers across the Southern and Midwestern US.

Powertrain Plants: Dedicated facilities producing engines, transmissions, electric motors, and battery packs.

Stamping Operations: Large-scale metal stamping facilities producing body panels, structural components, and closures.

EV & Battery Manufacturers: New entrants and legacy automakers building gigafactories for battery cells, packs, and EV-specific components.

Major industrial centers in Illinois include Chicago, Rockford, Peoria, Aurora, Joliet, and Elgin. These cities have concentrations of manufacturers across sectors including metal fabrication, food processing manufacturing, and chemical manufacturing.