Horgen has an area of . Of this area, 27.7% is used for agricultural purposes, while 49.9% is forested. Of the rest of the land, 20.4% is settled (buildings or roads) and the remainder (2%) is non-productive (rivers, glaciers or mountains). housing and buildings made up 12.5% of the total area, while transportation infrastructure made up the rest (7.9%). Of the total unproductive area, water (streams and lakes) made up 1.6% of the area. , 16% of the total municipal area was undergoing some type of construction.