Sizerville State Park is a 386-acre (156 ha) Pennsylvania state park in Portage Township, Cameron County and Portage Township, Potter County, Pennsylvania in the United States. The park is nearly surrounded by Elk State Forest making it part of one of the largest blocks of state-owned land in Pennsylvania. Sizerville State Park is on Pennsylvania Route 155, six miles (10 km) north of the borough of Emporium.

Cameron County is a county in the Commonwealth of Pennsylvania. As of the 2020 census, the population was 4,547 and is Pennsylvania's least populous county. Its county seat is Emporium. The county was created on March 29, 1860, from parts of Clinton, Elk, McKean, and Potter Counties. It is named for Senator Simon Cameron. The county is part of the North Central Pennsylvania region of the state.