Hannastown Farm, also known as the William Steel Farm, is a national historic district and farm which are located in Salem Township, Westmoreland County, Pennsylvania.

It was added to the National Register of Historic Places in 1994.

History and architectural features

This historic district encompasses nine contributing buildings, one contributing site, and one contributing structure, including a mansion house, which was built between 1866 and 1867, an overseer's house with a kitchen house, a bank barnm which was erected in 1868 and includes a silo, a wagon shed, a tractor shed, a garage, and related dependencies. The house is a 2+1⁄2-story, L-shaped, red brick Italianate-style dwelling. The property also includes a prehistoric archaeological site.

It was added to the National Register of Historic Places in 1994.