• Mass media by region in Ontario (4 C)

C

• Central Ontario (10 C, 5 P)

E

• Eastern Ontario (10 C, 4 P)

G

• Golden Horseshoe (6 C, 3 P)
• Greater Toronto Area (10 C, 8 P)

N

• Northern Ontario (20 C, 3 P)

S

• Southwestern Ontario (21 C, 28 P)

A

• Almaguin Highlands

E

• Eastern Ontario

G

• Ganaraska Region
• Georgian Triangle
• Golden Horseshoe
• Great Lakes megalopolis
• Greater Toronto and Hamilton Area

H

• Huronia (region)

N

• National Capital Region (Canada)

O

• Ontario Peninsula
• Ontario tobacco belt

Q

• Quebec City–Windsor Corridor

S

• Snowbelt
• Southern Ontario
• Southwestern Ontario