The calculated distance (air line) between Niedernhausen and Königstein im Taunus is approximately 7 miles respectively 11 kilometers.
By car or train, the actual journey to Königstein im Taunus is certainly longer, as only the direct route (as the crow flies) between Niedernhausen and Königstein im Taunus has been calculated here.
Air line (approximately)
11 kilometers
6 nautical miles