Transportation Department 710 180th Ave Monmouth, IL 61462 Phone : (309) 734-2912 Business Category Port Authorities State Of Illinois--transportation Dept Of, Monmouth Operation Yard 710 180th Ave Monmouth, IL 61462 Phone : (309) 734-2912 Business Category Government Offices-State Transportation Services Local Passenger Transportation Government Offices State & Local Government Offices & Public Schools Illinois State Of--transportation Dept Of, Division Of Highways, Monmouth Operation Yard Rr 4 Monmouth, IL 61462 Phone : (309) 734-2912 Business Category Government Offices-State Government Offices State & Local Government Offices & Public Schools