| Number
|
Length (km)
|
Length (mi)
|
Southern or western terminus
|
Northern or eastern terminus
|
Local names
|
Formed
|
Removed
|
Notes
|
 County Road 1
|
— |
—
|
St. Clair Parkway in Port Lambton |
Highway 40 east of Port Lambton
|
Lambton Line
|
— |
—
|
|
 County Road 2
|
— |
—
|
St. Clair Parkway in Sombra |
County Road 79 at Cairo
|
Bentpath Line
|
— |
—
|
|
 County Road 4
|
— |
—
|
St. Clair Parkway in Corunna |
County Road 79 north of Alvinston
|
Hill Street, Petrolia Line
|
— |
—
|
Originally called the 10th Line
|
 County Road 5
|
— |
—
|
Highway 21 near Grand Bend |
County Road 5 (Middlesex County) at the Ausable River
|
Greenway Road
|
— |
—
|
|
 County Road 6
|
— |
—
|
Highway 21 at Lambton Shores |
County Road 7 (Middlesex County) at the Ausable River
|
Thomson Line
|
— |
—
|
Easternmost section formerly Highway 7
|
 County Road 7
|
— |
—
|
Michigan Avenue in Sarnia |
Highway 21 at Lambton Shores
|
Christina Street, Lakeshore Road
|
— |
—
|
|
 County Road 8
|
— |
—
|
County Road 8 (Chatham–Kent) near Florence |
Highway 402 / Highway 21 near Warwick
|
Forest Road, Inwood Road, Shetland Road
|
— |
—
|
|
 County Road 9
|
— |
—
|
County Road 22 / County Road 79 near Warwick |
County Road 79 near Thedford
|
Northville Road
|
— |
—
|
|
 County Road 11
|
— |
—
|
County Road 7 near Camlachie |
Highway 21 near Forest, Ontario
|
Aberarder Line
|
— |
—
|
|
 County Road 12
|
— |
—
|
County Road 7 near Forest |
County Road 12 (Middlesex County) near Arkona
|
Townsend Line
|
— |
—
|
|
 County Road 14
|
— |
—
|
County Road 20 / County Road 31 at Sarnia |
County Road 22 near Wyoming
|
Churchill Line
|
— |
—
|
|
 County Road 15
|
— |
—
|
County Road 12 (Middlesex County) near Rutherford |
County Road 21 in Rutherford
|
Dawn Mills Road
|
— |
—
|
|
 County Road 16
|
— |
—
|
Vidal Street (southbound) / Brock Street (northbound) in Sarnia |
Highway 40 / County Road 22 in Sarnia
|
London Road
|
— |
—
|
Easternmost section formerly Highway 402
|
 County Road 17
|
— |
—
|
Vidal Street North (southbound) / Brock Street (northbound) in Sarnia |
Highway 40 in Sarnia
|
Wellington Street
|
— |
—
|
|
 County Road 18
|
— |
—
|
County Road 79 near Port Franks |
County Road 18 (Middlesex County) at the Ausable River
|
Bog Line
|
— |
—
|
|
 County Road 19
|
— |
—
|
County Road 29 in Sarnia |
County Road 27 at Sarnia
|
Michigan Avenue, Michigan Line
|
— |
—
|
|
 County Road 20
|
— |
—
|
Highway 40 at Sarnia |
County Road 4 near Sarnia
|
Plank Road
|
— |
—
|
|
 County Road 21
|
— |
—
|
County Road 21 (Chatham–Kent) near Dresden |
Highway 402 / County Road 30 at Reece's Corners
|
Oil Heritage Road, Broadway Street
|
— |
—
|
Formerly southern part of Highway 21
|
 County Road 22
|
— |
—
|
Highway 40 / County Road 16 in Sarnia |
County Road 22 (Middlesex County) near Warwick
|
London Line
|
— |
—
|
Formerly Highway 22 and westernmost section of Highway 7
|
 County Road 23
|
— |
—
|
County Road 79 in Alvinston |
County Road 80 near Alvinston
|
Railroad Street, River Street
|
— |
—
|
|
 County Road 25
|
— |
—
|
Vidal Street (southbound) / Brock Street (northbound) in Sarnia |
County Road 39 / County Road 79 in Watford
|
Confederation Line
|
— |
—
|
|
 County Road 26
|
— |
—
|
County Road 44 (Chatham–Kent) near Tupperville |
County Road 7 at Brights Grove
|
Mandaumin Road
|
— |
—
|
|
 County Road 27
|
— |
—
|
Highway 402 / Highway 40 at Sarnia |
County Road 7 at Sarnia
|
Modeland Road
|
— |
—
|
|
 County Road 28
|
— |
—
|
St. Clair Parkway near Sombra |
Highway 40 near Sombra
|
Holt Line
|
— |
—
|
|
 County Road 29
|
— |
—
|
Highway 40 at Sarnia |
County Road 7 at Sarnia
|
Indian Road
|
— |
—
|
|
 County Road 30
|
— |
—
|
Highway 402 / County Road 21 at Reece's Corners |
County Road 7 near Camlachie
|
Oil Heritage Road
|
— |
—
|
|
 County Road 31
|
— |
—
|
County Road 31 (Chatham–Kent) near Wallaceburg |
County Road 14 / County Road 20 at Sarnia
|
Kimball Road
|
— |
—
|
|
 County Road 33
|
— |
—
|
County Road 33 (Chatham–Kent) near Wallaceburg |
Vidal Street and County Road 34 at Sarnia
|
St. Clair Parkway
|
01977-01-011977 |
01984-01-011984
|
Formerly Highway 40; turned back in stages
|
 County Road 34
|
— |
—
|
St. Clair Parkway at Sarnia |
Highway 40 at Sarnia
|
Churchill Line
|
01993-01-011993 |
current
|
Formerly Highway 40 and Highway 40B
|
 County Road 35
|
— |
—
|
St. Clair Parkway near Corunna |
Highway 40 near Corunna
|
La Salle Line
|
— |
—
|
|
 County Road 36
|
— |
—
|
St. Clair Parkway near Courtright |
Highway 40 near Courtright
|
Bickford Line
|
— |
—
|
|
 County Road 39
|
— |
—
|
County Road 79 in Watford |
County Road 39 (Middlesex County) near Kerwood
|
Confederation Line
|
— |
—
|
|
 County Road 79
|
— |
—
|
County Road 16 (Chatham–Kent) near Bothwell |
Highway 21 near Port Franks
|
Northville Road, Arkona Road, Egremont Road, Nauvoo Road, Cairo Road
|
01998-01-011998 |
current
|
Formerly Highway 79 and Highway 7
|
 County Road 80
|
— |
—
|
St. Clair Parkway in Courtright |
County Road 80 (Middlesex County) near Alvinston
|
Courtright Line
|
— |
—
|
Formerly Highway 80
|
|
List of County roads