Jennerstown is a borough in Somerset County, Pennsylvania, United States. It is part of the Johnstown, Pennsylvania Metropolitan Statistical Area. The population was 679 at the 2020 census. The borough is the home of Jennerstown Speedway. The town was named for Edward Jenner. Jennerstown is located north of Somerset and south of Johnstown. It is also west of Boswell. It is connected with Route 30.