U.S. Federal Route 12 is a east-west highway running across Cook County. In Western Cook County, this highway runs north-south. U.S. Rt. 12 passes through the following towns in Cook County. Palatine Arlington Heights
Prospect Heights
Mount Prospect Des Plaines
Schiller Park
Franklin Park Melrose Park
Stone Park Bellwod Hillside
Westchester
La Grange Park
La Grange Countryside Justice Willow Springs
Hickory Hills Bridgeview Oak Lawn Chicago Ridge
Evergreen Park Chicago U.S Rt. 12 is multi-plexed in Cook County. Illinois State Route 53, at Palatine.
U.S. Rt. 45, from Des Plaines to near Hickory Hills.
U.S. Rt. 20, from Melrose Park to the Indiana/Illinois State Line.
Junction marker on SB IL St Rt 53. EB U.S. Rt. 12/SB IL St. Rt. 53 in Palatine. BGS on NB IL St Rt 53. A set of guide markers on WB U.S. Rt. 14. A set of BGS's on WB I-190. EB U.S. Rt. 12/SB U.S. Rt. 45 at O'Hare International Airport. A junction marker on EB IL St Rt 64. A junction marker on EB U.S. Rt. 20. A street sign on a stop light mast in Melrose Park. A BGS on EB I-290. A junction marker on EB IL St Rt 38. EB U.S. Rt. 12/20; SB U.S. Rt. 45 in La Grange Park. A junction marker on EB U.S. Rt. 34. A set of guide markers on EB U.S. Rt. 34. EB U.S. Rt. 12/20; SB U.S. Rt. 45 north of I-55. A BGS on NB I-55. Another BGS on NB I-55. EB U.S. Rt. 12/20; NB U.S. Rt. 45 in Willow Springs. A BGS on NB IL St Rt 171. EB U.S. Rt. 12/20; SB U.S. Rt. 45 at I-294/IL St Rt 171. A BGS on SB I-294. A BGS on SB I-294. A BGS on NB I-294. WB U.S. Rt. 12/20 west of IL St Rt 43. A BGS on NB IL St Rt 43. EB U.S. Rt. 12/20 in Oak Lawn. EB U.S. Rt. 12/20 in Evergreen Park. BGS on EB I-94. A temporary BGS on the EB Chicago Skyway. (July, 2004)
