As early as 1885, Salem Township's supply of coal attracted companies to build mines and "coal patch" towns. In 1916, Slickville was the last coal patch town built in Salem Township. When the demand for soft coal declined, the companies abandoned the mines, leaving the towns to survive on their own. Delmont, originally known as Salem Crossroads or New Salem, is one of the oldest boroughs in Westmoreland County. Formed around a spring that was eventually piped to a watering trough that still remains, Delmont boasted a busy stagecoach route and was one of the main stagecoach stops on the Northern Turnpike. The arrival of the railroad left little need for stagecoaches, but Delmont continued to survive. In 1993, the Pennsylvania Turnpike 66 opened just south of Delmont in Salem Township, bringing promise to a community once disappointed by Northern Turnpike's decline. Salem Township and Delmont provides a glimpse into the rich history of these communities.

Anthony Newhouse was born in about 1751 in Montgomery County, Pennsylvania. His father was Jacob Newhouse or Neuhaus. He married Elizabeth and they had nine known children. He died in 1829 in Westmoreland County, Pennsylvania. Descendants and relatives lived mainly in Pennsylvania, West Virginia, Kansas and Washington.

Salem Lutheran Church is located at Killinger in Upper Paxton Township.