Ontario Highway 637
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| Route information | ||||
| Length: | 67.8 km (42.1 mi) | |||
| Existed: | July 20, 1962 – present | |||
| Major junctions | ||||
| West end: | Channel Street in Killarney | |||
| East end: |
 Highway 69 at Rock Bay |
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Secondary Highway 637, commonly referred to as Highway 637 is a provincially maintained secondary highway in the Canadian province of Ontario. Located entirely within Sudbury District, the highway connects Highway 69 to the primary townsite of Killarney, 67.8 kilometres (42.1 mi) away, as well as providing access to Killarney Provincial Park.
The highway was opened in 1962. Prior to its completion, the community of Killarney relied primarily on water transport via Georgian Bay and the North Channel. The route has remained unchanged since then, aside from a very short extension to meet the realigned Highway 69 (future Highway 400) interchange.
Highway 637 is a long and isolated secondary highway which travels north of Georgian Bay. It begins in the town of Killarney at Channel Street, near the shoreline of the bay. From there it travels eastward through the barren wilderness of the Canadian Shield, passing through lakes, swamps, forests, and rocks on its 67.8-kilometre long (42.1 mi) journey to Highway 69. The route provides access to Killarney Provincial Park, Atley Central Forest Provincial Conservation Reserve and Atlee Provincial Conservation Reservation. Near the rail siding of Porlock, the highway crosses a Canadian National Railway line. It circles around the northern shore of Kakakiwaganda Lake before ending at an interchange with Highway 69 midway between French River and Sudbury.
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