Spring Township is a township in Crawford County, Pennsylvania, United States. The population was 1,409 at the 2020 census, down from 1,548 at the 2010 census. Spring Township is in northwestern Crawford County, bordered to the north by Erie County. The borough of Springboro is in the western part of the township, and the borough of Conneautville is alo…Spring Township is a township in Crawford County, Pennsylvania, United States. The population was 1,409 at the 2020 census, down from 1,548 at the 2010 census. Spring Township is in northwestern Crawford County, bordered to the north by Erie County. The borough of Springboro is in the western part of the township, and the borough of Conneautville is along the southern border; the boroughs are separate municipalities from the township. Conneaut Creek, a tributary of Lake Erie, flows from south to north through the western side of the township. The Rundell Cemetery, a remnant of the hamlet of Rundell, also known as Rundelltown, with its post office named Rundell's, is located east of the bend of Rundelltown Road beside Rundelltown Creek, off King Road.