Upper Saint Clair is a census designated place in Allegheny County, Pennsylvania, United States. In 2010, the population of the area was 19,229, with a density of 1,962 people per square kilometer. The city has a population of approximately 19,896 as of 2020. Founded 192 years ago, the city is home to a number of prominent businesses and institutions.
The St. Clair River and power plants are prominent locations in the community. The St. Clair Power Plant, as well as the Belle River, are located in the area. Several other industries are located in the area, including manufacturing and agriculture. Upper Saint Clair City also has a large Italian community. The local government has a Board of Commissioners that makes decisions regarding public safety and the general welfare of the community.
While Upper Saint Clair, PA has a relatively low rate of tornado activity, it does rank among the lower half of cities and towns in Pennsylvania. The area had a category F4 tornado in June 1980 that injured 140 people and caused $50,000,000 to $500 million in damage. Earlier in the century, a category F3 tornado killed two people and injured 70, causing $5,000,000 to $50 million in damage.
The city's median age is 43.4, older than the national average of 38.1, but younger residents tend to vote for democrats. Upper Saint Clair is home to a number of wealthy families with handsome homes and white fences. The Twin Rivers Elementary and Intermediate School offers a 13:1 student-teacher ratio. And it has a growing number of Asian residents. There are many reasons why it's a desirable place to live.