Major Cities and Towns on Lake Ontario's Shores

Lake Ontario — the easternmost, smallest by surface area (18,960 km²) but deep (max 244 m) Great Lake — anchors major urban centers on both sides of the Canada-US border.

Canada (Ontario Province)

• Toronto (pop. 2.9M metro) — Canada's largest city, financial capital, on NW shore.
• Mississauga (717K) — immediately west of Toronto, Pearson Airport.
• Hamilton (569K) — west end, "Steel City," Niagara Escarpment waterfalls.
• Oshawa (175K) — east of Toronto, auto manufacturing (GM).
• Burlington (186K) — between Hamilton and Oakville, waterfront parks.
• St. Catharines (136K) — Niagara Region, Welland Canal access.
• Kingston (132K) — NE end, historic capital, Thousand Islands gateway, RMC.

United States (New York State)

• Rochester (211K metro 1.1M) — 15 km south of shore (Genesee River), optics/imaging hub.
• Oswego (17K) — only major US port directly on lake, SUNY campus, harbor.
• Syracuse (148K metro 662K) — 50 km south (Oneida Lake / Oneida River connection), central NY hub.

Notable Smaller Communities

• Canada: Cobourg, Port Hope, Brighton, Picton (Prince Edward County).
• US: Sodus Point, Fair Haven, Henderson Harbor, Cape Vincent (Thousand Islands).

Cross-Lake Connections

• Ferry: Toronto ↔ Rochester (seasonal, high-speed catamaran).
• Thousand Islands bridge system (I-81 / ON-401) at eastern end.

Lake Ontario's shore is the most heavily urbanized of the Great Lakes — 9+ million people within 50 km.