Stewartstown is a borough in York County, Pennsylvania, United States. The population was 2,125 at the 2020 census.

There were settlers in the Stewartstown Place as in the future as 1750. This allocation of southern York County was claimed by both Maryland and Pennsylvania, and the boundary difference of opinion was contracted by the surveying of the Mason–Dixon Line in 1767.

By 1777, a road had been well established in the middle of York and Baltimore, and Stewartstown’s main street of today lies along a allocation of the road. Around 1812, a charity of farmers set out to avow a town in south central Hopewell Township. The prehistoric buildings were several houses, a workshop for making furniture and wheels, a store, and a tavern. Anthony Stewart, owner of the workshop, served as the village clerk, and his shop became the main meeting place.

The village was first known as Meadstown, after Benedict Meads, owner of the tavern and the store. Later it became known as Mechanicsburg because of a large number of tradesmen who lived in the community. By 1828, the town had its own make known office, and Stewart was appointed the first postmaster. There was already complementary Pennsylvania town named Mechanicsburg, so postal officials assigned the name “Guilford” to the community. Through the efforts of Anthony Stewart, with the encourage of Judge Adam Ebaugh, the Post Office Department distorted the town’s postmark to “Stewartstown” on March 24, 1832.