Irwin is a small borough located in Westmoreland County, Pennsylvania, United States. It is situated approximately 22 miles southeast of Pittsburgh and is part of the Pittsburgh metropolitan area. Irwin is known for its historic downtown area, which features a variety of shops, restaurants, and cultural attractions. The borough of Irwin has a rich history, with many of its buildings dating back to the 19th century. The community takes pride in preserving its historic architecture and has been designated as a National Historic District. Visitors to Irwin can explore the charming streets lined with Victorian-era homes and storefronts, as well as visit landmarks such as the Irwin Depot and the Lamp Theatre.