The calculated distance (air line) between Willowridge-Martingrove-Richview and Markham is approximately 19 miles respectively 31 kilometers.
By car or train, the actual journey to Markham is certainly longer, as only the direct route (as the crow flies) between Willowridge-Martingrove-Richview and Markham has been calculated here.
Air line (approximately)
31 kilometers
17 nautical miles