Marienville, Pennsylvania

Marienville is an unincorporated community and census-designated place (CDP) in Jenks Township, Forest County, Pennsylvania, United States. Its altitude is 1735 ft, and it is located at 41.47°N, -79.12472°W (41.4702014, -79.1247623). Other names for the community have included "Marion" and "Marionville". Marienville is a major point on a well-known ATV trail. According to the 2010 census the population of Marienville was 3,137.

Marienville is the location of the SCI Forest state penitentiary.

Geography
The community is in southeastern Forest County near the center of Jenks Township. Pennsylvania Route 66 is the main street, leading northeast 24 mi to U.S. Route 6 at Kane and southwest 27 mi to Interstate 80 near Clarion. Pennsylvania Route 899 leads south from Marienville 10 mi to Clarington.

According to the U.S. Census Bureau, the Marienville CDP has a total area of 15.7 sqkm, all land.