Redding is a city in and the county seat of Shasta County, California, United States, in the northern part of the state. It lies along the Sacramento River, 162 mi north of Sacramento, and 120 mi south of California's northern border, shared with the state of Oregon. Interstate 5 bisects the entire city, from the south to north before it approaches Shasta Lake, which is located 15 mi to the north. The 2010 population was 90,322. Redding is the largest city in the Shasta Cascade region, and it is the sixth-largest city in the Sacramento Valley, behind Chico, Sacramento, Elk Grove, Roseville, and Vacaville.