The calculated distance (air line) between Neder-Hardinxveld and Zaanstad is approximately 43 miles respectively 69 kilometers.
By car or train, the actual journey to Zaanstad is certainly longer, as only the direct route (as the crow flies) between Neder-Hardinxveld and Zaanstad has been calculated here.
Air line (approximately)
69 kilometers
37 nautical miles