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.

In 1718, Sir William Keith, then provincial governor of Pennsylvania, acquired 1,200 acres (4.9 km2) of Carpenter's land on which he erected a house in keeping with the dignity of his office.

The development of Keith's "plantation" proved to be a step in establishing closer ties between Horsham and neighboring communities, particularly those of Hatboro and Willow Grove.

Keith's extension of Easton Road prompted the establishment of the Horsham Friends Meeting House.

Prospectville, on a high elevation point within the township, offering a resting spot with a tavern for those traveling along either Limekiln Pike or Horsham Road.

The "Golden Ball Inn", which at one time was used to house guests of Governor Keith, enjoyed much Revolutionary splendor.

Expansion of the Willow Grove Naval Air Station caused the closing of these roads and the absorption of the hamlet.

Its character was not altered in any significant way until about 1872, when the North Pennsylvania Railroad extended a rail line from Glenside to New Hope and established a station in the nearby community of Hatboro, 2.75 miles (4.4 km) east of the nucleus of Horshamville.

In 1926, aviation pioneer Harold F. Pitcairn, purchased a large section of farmland on the west side of Doylestown Pike (now Route 611) and constructed a hangar and a grass airstrip.

From 1926 to 1942 Pitcairn used the airfield for numerous air shows and to design, construct and test a number of aircraft, including the Mailwing which was used by the United States Postal Service to carry the overnight mail between New York and Atlanta.

In 1942, the United States Navy purchased what eventually became the Naval Air Station Joint Reserve Base (NAS-JRB) Willow Grove which contributed to national defense for over six decades, beginning with a small group of Naval Aviators, maintenance personnel, and biplanes and evolving into a home for aircraft and personnel from every branch of the United States Armed Forces.

On April 27, 2012, the Horsham Township Authority for NAS-JRB (HLRA) submitted the NAS-JRB Willow Grove Redevelopment Plan and Homeless Assistance Submission to the United States Department of Housing and Urban Development (HUD) and United States Navy.

Its villages include Prospectville, Maple Glen (also in Upper Dublin Township,) Hallowell, and Horsham.

The township has a hot-summer humid continental climate (Dfa) and average monthly temperatures in the vicinity of the junction of routes 463 and 611 range from 31.8 °F in January to 76.6 °F in July.

Major Employers located in Horsham The Hatboro-Horsham School District serves the township along with nearby Hatboro.

The parks contain playground equipment, sand volleyball, tennis courts, picnic pavilions and fields for baseball, softball, soccer, lacrosse and football.

[13][14] Three additional bus routes serve the business parks in the southern portion of Horsham Township.

[18] Electricity and natural gas in Horsham Township is provided by PECO Energy Company, a subsidiary of Exelon.

[19][20][21] Trash and recycling collection in the township is provided by private haulers including Arthur Moore, Republic Services, Waste Management, Advanced Disposal, Horizon Waste, and Whitetail Disposal, Inc.[22] Cable, telephone, and internet service to the area is provided by Xfinity and Verizon.

The water system in Horsham Township consists of 15 wells, five above-ground storage tanks, and 103 miles (166 km) of distribution lines, serving 7,042 customers.

Multiple groundwater wells in the township are contaminated with perfluorooctanesulfonic acid (PFOS) and perfluorooctanoic acid (PFOA) from the former Naval Air Station Joint Reserve Base Willow Grove site, leading to the authority having to close wells to install treatment systems to decontaminate the water.