In 1682, William Penn deeded 50,000 acres in what is now Londonderry Township to his relative John Fagg.

The township was profiled in a 2007 book, Last Harvest: How a Cornfield Became New Daleville by Witold Rybczynski, who divided the population into four types: farmers, who made up only 10 percent of the population; large wealthy landowners, who make up another 10 percent and often raise horses; old suburbanites; and new suburbanites.

[7] According to the U.S. Census Bureau, the township has a total area of 11.3 square miles (29 km2), of which 0.09% is water.

At the 2010 census, the township was 91.1% non-Hispanic White, 1.0% Black or African American, 0.8% Asian, and 1.0% were two or more races.

PA 41 follows Gap Newport Pike along a northwest-southeast alignment through the central portion of the township.

Finally, PA 926 follows Street Road along a southwest-northeast alignment through the southern and central portions of the township.