The calculated distance (air line) between Târgu Ocna and Piatra Neamţ is approximately 46 miles respectively 74 kilometers.
By car or train, the actual journey to Piatra Neamţ is certainly longer, as only the direct route (as the crow flies) between Târgu Ocna and Piatra Neamţ has been calculated here.
Air line (approximately)
74 kilometers
40 nautical miles