The calculated distance (air line) between Horgen and Zürich (Kreis 10) is approximately 11 miles respectively 18 kilometers.
By car or train, the actual journey to Zürich (Kreis 10) is certainly longer, as only the direct route (as the crow flies) between Horgen and Zürich (Kreis 10) has been calculated here.
Air line (approximately)
18 kilometers
10 nautical miles