The calculated distance (air line) between Horgen and Zürich (Kreis 9) is approximately 10 miles respectively 16 kilometers.
By car or train, the actual journey to Zürich (Kreis 9) is certainly longer, as only the direct route (as the crow flies) between Horgen and Zürich (Kreis 9) has been calculated here.
Air line (approximately)
16 kilometers
9 nautical miles