Irwin is a borough in Westmoreland County, Pennsylvania, 22 miles (35 km) southeast of Pittsburgh. Some of the most extensive bituminous coal deposits in the State are located here. In the past, iron foundries, flour mills, car shops, facing and planing mills, electrical goods, and mirror factories provided employment to the residents. In 1900, the population numbered 2,452; it increased to 2,886 in 1910. The population was 4,366 at the 2000 census. According to the United States Census Bureau, the borough has a total area of 0.9 square miles (2.3 km2), all of it land. Brush Creek Cemetery is located outside of Irwin. It is a non-profit, non-sectarian cemetery.