1910-1923 - Chicago Aurora & De Kalb Railroad Co.
Interurban line:
Aurora-De Kalb (electrified 1910)
Abandoned 1923
1899-1930 - Chicago Harvard & Geneva Lake Railway
Interurban line:
Harvard-Fontana (completed 1899)
Abandoned 1930
1907-1927 - Elgin & Belvidere Electric Co.
1927-1930 - Elgin Belvidere & Rockford Railway
1927 - buses introduced
1930 - interurban trains discontinued
1927-1928 - Elgin Belvidere & Rockford Railway
1928-1929 - Royal Rapid Transit Co.
After 1929 - Northland Greyhound Lines
Interurban line:
Elgin-Belvidere (completed 1907)
Abandoned 1930
1911-1931 - Fox & Illinois Union Railway Co.
Interurban line:
Yorkville-Morris (completed 1911)
Abandoned 1931
1904-1914 - Joliet Plainfield & Aurora Railroad Co.
1914-1924 - Aurora Plainfield & Joliet Railway
1924 - interurban trains discontinued
1924-1939 - Joliet Plainfield & Aurora Transportation Co.
After 1939 - Joliet Manhattan & Kankakee Transportation Co.
Prior to 1969 - Joliet-Aurora Transit Lines
Interurban line:
Joliet-Aurora (completed 1904)
Abandoned 1924
1909-1923 - Joliet & Eastern Traction Co.
1923 - interurban trains discontinued
After 1924 - Chicago Heights & Joliet Transportation Co.
Prior to 1966 - Gold Star Line
Interurban line:
Joliet-Chicago Heights (completed 1909)
Abandoned 1923