The 300 acres of land was warranted to William Wilson in 1784, and upon his arrival in 1785, he named the area New Salem.

Eventually, the family conveyed their deeds to Thomas, who became the property's sole owner.

Thomas Wilson designed the town around a watering trough built in 1810 by Hugh Bigham.

The watering trough was connected with wooden pipes to a big Spring that's never known to run dry.

The mailing address was Salem Crossroads until 1871 when town postmaster Zachariah Zimmerman changed it to Delmont.

Delmont was a busy stagecoach stop boasting at one time five stage coach lines through the village.

Downtown Delmont lost some businesses with the opening of chain retailers along the U.S. Route 22 corridor.

Residents have discussed ways to reinvest in downtown Delmont and focus again on the town's historic resources.

[7] Salem Township and Delmont, a book about the area's history by writer Tracy Searight, was published in 2012.

[9] According to the U.S. Census Bureau, the borough has a total area of 1.1 square miles (2.8 km2), all land.

This change was made to accommodate the widening of Route 22, one of Pennsylvania's most heavily traveled roads.

The interchange on Route 22 marks the boundary between suburban Pittsburgh and the more rural foothills of the Appalachian Mountains.

Other notable roads within Delmont's borders include Old William Penn Highway, which begins at the termination of Pittsburgh Street, just west of Route 66, and Manor Road, which begins on the west side of Route 66 as well, just across from Greensburg Street, and runs from 66 through the southeastern portion of the 22/66 corridor until it reaches Route 22 outside of city limits, as 22 goes toward Export and Murrysville.