Elysburg is a census-designated place in Northumberland County, Pennsylvania, United States. The population was 2,067 at the 2000 census. The area's biggest attraction is Knoebels Amusement Park, which boasts two world-class wooden roller coasters. Elysburg apartments for rent comparison page shows most up to date rent information on Elysburg apartments and houses. Rent information is obtained from multiple rental sources but we cannot guarantee their accuracy.