List of Former Provincial Highways in Ontario - Secondary Highways

Secondary Highways

• Highway 503 – Between Highway 48 in Kirkfield and Highway 121 in Tory Hill. Now Kawartha Lakes Road 6, Kawartha Lakes Road 45, Peterborough County Road 503 and Haliburton County Road 503.
• Highway 508 – Highway 17 west of Arnprior to Calabogie. Entirely downloaded to Renfrew County.
• Highway 511 – Perth to Calabogie. Entirely downloaded to Lanark and Renfrew counties.
• Highway 517 – Used to run from Boulter to Combermere at Highway 62. Downgraded to county road status in Hastings and Renfrew counties.
• Highway 536 – Passes by the ghost town of Creighton Mine near the town of Lively in Greater Sudbury. Redesignated as Municipal Road 24.
• Highway 537 – Wanup to Wahnapitae in Greater Sudbury. Partially redesignated as Municipal Road 537.
• Highway 541 – New Sudbury, Garson and Skead. Redesignated as Municipal Road 86.
• Highway 543 – Highway 69 to Dew Drop Road in Sudbury. Downloaded in 1973 upon the creation of the Regional Municipality of Sudbury as Long Lake Road, part of Regional Road 80. Now designated Greater Sudbury Municipal Road 80.
• Highway 544 – Downtown Sudbury to Cartier. Redesignated as Highway 144 in 1965, as extension to Timmins was under construction.
• Highway 545 – Hanmer, Capreol and Selwood. Redesignated as Municipal Road 84.
• Highway 549 – Whitefish to Lake Panache in the town of Walden; downloaded in mid-1980s and now designated as Greater Sudbury Municipal Road 10.
• Boulter Road was an un-numbered secondary highway from at least the 1930s. It was downloaded in 1998, with its more-well-known brother road, Highway 517.
• Highway 550B – Sault Ste. Marie business route linking Highway 550 with the Sault Ste. Marie International Bridge. Returned to original city street names when Ontario decommissioned most B-series highways.
• Highway 620 – Peterborough County route linking Highway 28 to Highway 62, entirely downloaded in 1997 to Peterborough and Hastings County
• Highway 634 – Chelmsford to Val Caron. Redesignated as Municipal Road 15 in the early 1970s. A different unrelated Highway 634 is now located in Smooth Rock Falls, which was the former Highway 807.
• Highway 635 – Rolphton to Rapides-des-Joachims, Quebec. Interprovincial crossing downloaded to Renfrew County.
• Highway 646 – Linking Highway 599 with sites in the township of Pickle Lake. Now identified on signage as Pickle Lake Road.
• Highway 653 – Chenaux Road. Interprovincial crossing to Portage-du-Fort, Quebec; downloaded to Renfrew County.
• Highway 658 – Victoria Mine (ghost town) near Worthington. Redesignated as Municipal Road 4. Number was later revived on a different highway near Kenora.
• Highway 807 – Fraserdale to Highway 11 at Smooth Rock Falls. Redesignated as Highway 634 in 1977. See Highway 634, an unrelated highway known today as municipal road 15 located in Greater Sudbury.