Horsham Township administration offices are located at 1025 Horsham Road, Horsham PA 19044; phone: 215-643-3131.
The township was incorporated in 1709.
Horsham Township is named after the town of Horsham in Sussex County, England. Horsham is one of several townships in Montgomery County whose name and size were determined by master survey lines drawn by William Penn's engineers as they first plotted this part of the colony for sale and settlement. Parallel lines, projected at intervals of a mile and a half and extending in a northwesterly direction from settlements along the Delaware, served not only as base lines for measurement of individual land grants but also as courses for future highways. County Line Road, Horsham Road, and Welsh Road are examples of highways so laid out. The effect of these survey lines upon the development pattern of Eastern Montgomery County is very much in evidence today.
In 1684, the entire township of 17 square miles was made available to individual purchasers. Samuel Carpenter, from the town of Horsham in Sussex County, England, after which the township is named, purchased five thousand acres, forty two hundred of them within the present boundaries of the township. In 1709, Carpenter, then Treasurer of Pennsylvania, began to sell tracts of land to migrating Quakers. In 1717, Horsham Township was established as a municipal entity by a vote of the people.