State park · Lake Ontario · New York
Mary Island State Park
A state park on the St. Lawrence River in Jefferson County, New York, established 1897, 13 acres. It counted 3,415 visitors in 2014. In or beside it: a lighthouse.
The park
On the record
- Water
- St. Lawrence River (Lake Ontario system)
- Location
- Jefferson County, New York
- Established
- 1897
- Area
- 13 acres
- Visitors
- 3,415 in 2014
- Run by
- New York State Office of Parks, Recreation and Historic Preservation
- Coordinates
- 44.3670° N, 75.9200° W
Coordinates mark the park as Wikipedia pins it, not a gate or a lot. For big parks that can be miles from the beach.
Along the shore
Nearest Ontario state parks
- Keewaydin State Park3.3 mi · 282 ac · NY
- Kring Point State Park3.3 mi · 61 ac · NY
- Dewolf Point State Park4.3 mi · 13 ac · NY
- Waterson Point State Park4.7 mi · 6 ac · NY
- Wellesley Island State Park6.1 mi · 2,636 ac · NY
- Grass Point State Park7.0 mi · 114 ac · NY
Straight-line distance.
On the water
What to fish on Lake Ontario
Source
Facts on this page are from the infobox of the Wikipedia article on Mary Island State Park and its Wikidata record, retrieved 2026-10-11. Beaches are from EPA’s BEACH Act list and lighthouses from Wikidata. A blank field means the record is silent. Rules, hours and fees change; the park’s operator has the final word.
Chart shoreline generalized from Natural Earth (public domain). Not for navigation. Something wrong or missing? Write to contact@greatamericanlakes.com.