Greensburg is a city in Westmoreland County , Pennsylvania , United States , and a part of the Pittsburgh Metro Area . The city is named after Nathanael Greene , a major general of the Continental Army in the American Revolutionary War . Greensburg is the county seat of Westmoreland County , with a population of 14,892 people residing in the city, and a combined total of around 70,000 people in the 15601 zip code. Located southeast of Pittsburgh , Greensburg is a major business , tourism and cultural center in Western Pennsylvania . It is evident as the city's population doubles during work hours. The city ranks seventh in Pennsylvania in terms of daytime growth, behind Pittsburgh , Philadelphia , Harrisburg , King of Prussia , Lancaster , and State College . It also ranks 16th in the United States for daytime growth among towns with a resident population between 15,000 to 24,999. In 2007, Greensburg was designated as one of the "Best Places to Retire" in Pennsylvania by U.S. News & World Report .
History After the end of the Revolutionary War, an inn was built along a wagon trail that stretched from Philadelphia west over the Appalachian Mountains to Fort Pitt , now the city of Pittsburgh . A tiny settlement known as Newtown grew around the inn, today the center of Greensburg's Business District at the intersection of Pittsburgh and Main Streets. At Pittsburgh, the wagon trail became Penn Avenue . In 1782, a raid by Guyasuta -led Seneca Indians accompanied by Canadian rangers burned Hannastown , the original Westmoreland County seat, north of Greensburg, and the first county seat west of the Appalachian Mountains . Newtown became the new county seat in 1785. In 1786, the county built a log courthouse on land purchased from two residents, Christopher Truby and William Jack. The Westmoreland County Courthouse , in its various incarnations, has stood on this site. The area surrounding the courthouse became the original borough of Greensburg, named for American Revolutionary War General Nathanael Greene , and formally incorporated as a borough in 1799. In the early 19th century, Greensburg had very little growth. After 1850, Greensburg became a growing county seat with inns, small businesses and hardworking residents.