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.