John Street (Markham)

John Street (Markham)

John Street is an east-west arterial road in the city of Markham, Ontario. It is one of the oldest roads in the city of Markham and forms the backbone of the 200 year old community of Thornhill.

The street originally ran east from Yonge Street across a tributary of the Don River, at which point it branched north to what is now Leslie Street and south on German Mills Road. This was a travelled road which did not match the alignment of any concession road or lot line and was constructed along the most convenient route to farms and mills to serve the needs of the inhabitants at that time. In the late 20th century an extension was made across Highway 404 and through an industrial area to connect to Woodbine Avenue, east of which it joins with Esna Park Drive.

John Street has had a major impact in shaping the community; the parallel Green Lane/14th Avenue east-west road allowance has never been fully opened and Leslie Street still diverts from the route laid out by the township survey to join Don Mills Road near the former easterly end of John Street.