Red Bluff is a city in and the county seat of Tehama County, California. The population was 14,710 at the 2020 census, up from 14,076 at the 2010 census. It is located 131 miles (211 kilometers) north of Sacramento, 31 miles (50 km) south of Redding, and it is bisected by Interstate 5. Red Bluff is situated on the banks of the upper Sacramento River.

Corning is a city in Tehama County, California, that is located about 19 miles (31 km) south of Red Bluff and about 100 miles (160 km) north of Sacramento. The population was 8,244 at the 2020 census, up from 7,663 at the 2010 census.

Los Molinos is a census-designated place (CDP) in Tehama County, California, United States. The population was 2,037 at the 2010 census, up from 1,952 at the 2000 census.

Tehama is a city in Tehama County, California, United States. The population of Tehama was 435 at the 2020 census, up from 418 at the 2010 census. The city was founded by Robert Hasty Thomes in 1844 and was one of the earliest California settlements north of Sacramento. Tehama was established as the County Seat of Tehama County in 1856 but lost this status to Red Bluff the following year.

Vina is a census-designated place in Tehama County, California. Vina sits at an elevation of 210 feet (64 m). The 2020 United States census reported Vina's population was 198. Vina is the location of the Roman Catholic Trappist Abbey of New Clairvaux.

Lake Helen is a glacial lake or a tarn occupying a cirque at around 8,200 feet (2,500 m) in Lassen Volcanic National Park. Nestled at the base of Lassen Peak, this deep, blue lake offers one of the most dramatic scenic views in the park. The park highway winds around the lake's south and west shores and affords spectacular views of numerous volcanic peaks.

Gerber-Las Flores is a former census-designated place (CDP) in Tehama County, California, United States. The population was 1,389 at the 2000 census. Today, Gerber-Las Flores no longer exists as a CDP, as it was likely merged into the nearby town of Gerber, which had a population of 1,049 as of 2021. Gerber offers a suburban rural mix feel, and many residents rent their homes.