 Rockingham is bisected by another geographic formation, Massanutten Mountain stretching from just east of Harrisonburg, VA to a few miles southwest of Front Royal, VA in Warren County, VA. Massanutten Mountain splits the central Shenandoah Valley as the German River and the North Fork Shenandoah River flow on its western side and the South Fork flows on the eastern.As of the census of 2000, 67,725 people, 25,355 households, and 18,889 families resided in the county.The population density was 80 people per square mile (31/km2).