The route serves to connect the towns of East Gwillimbury and Aurora to the Toronto district of North York. The Keswick community in Georgina, the namesake of the route, is served indirectly by local bus service.
This route operates primarily on Highway 404 and Highway 401.
Monday to Friday only, the 67 Keswick-North York route operates from the Woodbine Park and Ride to the Finch Bus Terminal, making stops at the Queensville Park and Ride Aurora/Highway 404 Carpool.
Route 69 Sutton-Newmarket was discontinued on September 1, 2012 with bus service along the route taken over by York Region Transit's route 50 Queensway starting the following day. At the same time, route 67 was introduced, along with route 80 Beaverton-Pefferlaw to maintain bus service between the communities of Beaverton and Pefferlaw in Brock and Georgina. A new 65F branch of the route 65 Newmarket-Toronto was also introduced, providing direct service from East Gwillimbury GO Station to the Union Station Bus Terminal in downtown Toronto.
With the extension of Highway 404 north to Woodbine Avenue completed September 17, 2014, service on route 67 was modified January 3, 2015, serving two new park-and-rides along the extension at Queensville Sideroad and Woodbine Avenue. Service directly to Keswick via the Glenwoods Park and Ride was discontinued, replaced with a shuttle service provided by YRT route 51 Keswick Local.