Red Bluff is a city in and the county seat of Tehama County, California, United States. The population was 14,710 at the 2020 census, up from 14,076 at the 2010 census. It is located 131 miles north of Sacramento, 31 miles south of Redding, and it is bisected by Interstate 5. Red Bluff is situated on the banks of the upper Sacramento River. Located in the northernmost part of California’s Central Valley, the city marks the northern end of a vast contiguously cultivated area that extends all the way to Bakersfield, 400 miles to the south. Mildly rugged terrain, used as rangeland, separates Red Bluff from the next crop areas to the north in Cottonwood.