The calculated distance (air line) between Mataró and L'Ametlla del Vallès is approximately 13 miles respectively 20 kilometers.
By car or train, the actual journey to L'Ametlla del Vallès is certainly longer, as only the direct route (as the crow flies) between Mataró and L'Ametlla del Vallès has been calculated here.
Air line (approximately)
20 kilometers
11 nautical miles