Eureka is the principal city and county seat of Humboldt County in the Redwood Empire region of California. At the 2010 census, the population of the city was 27,191, and the population of Greater Eureka was 45,034.

Fortuna is a city on the northeast shore of the Eel River, approximately 9 miles (14 km) from where it enters the Pacific Ocean, and is on U.S. Route 101 in west-central Humboldt County, California, United States. The population was 12,516 at the 2020 census, up from 11,926 at the 2000 census.

Loleta is a census-designated place in Humboldt County, California. Loleta is located 5.5 miles (9 km) south of Fields Landing, and 15 miles (24 km) south of Eureka at an elevation of 46 feet (14 m). The population was 783 at the 2010 census. Residents live in a central community area and rural outskirts.

Trinidad is a small coastal town located in Humboldt County, California, USA. The town is situated on a rocky promontory overlooking the Pacific Ocean and is known for its stunning natural beauty, rugged coastline, and rich cultural history.

Blue Lake is a small town located in Humboldt County, California, in the United States. It is situated in the northern part of the state, near the city of Arcata and the larger Eureka area. The town is named after the nearby Blue Lake, a small body of water known for its scenic beauty. Its population is 1,208 as of the 2020 census, down from 1,253 from the 2010 census.

Manila is a small community located in Humboldt County, California. It is situated on the Samoa Peninsula, just west of Eureka and adjacent to the Pacific Ocean. The community is known for its coastal location and natural beauty. The population was 798 at the 2020 census

Big Lagoon is a census-designated place in Humboldt County, California. It is located 7 miles (11 km) north of Trinidad, at an elevation of 56 feet (17 m). Its population is 161 as of the 2020 census, up from 93 from the 2010 census.

Samoa is a small unincorporated community located in Humboldt County, California, on the Samoa Peninsula. It is situated just west of Eureka, adjacent to the mouth of Humboldt Bay. The community of Samoa was historically associated with the lumber and fishing industries, and remnants of its industrial past can still be seen in the area. The population was 229 at the 2020 census.

Arcata is a small city located on the Northern California coast in Humboldt County. Situated approximately 280 miles north of San Francisco, Arcata is known for its natural beauty, vibrant community, and connection to the surrounding natural environment. At the 2020 census, Arcata's population was 18,857.

Ferndale is a charming and historic city located in Humboldt County, California, nestled along the coast. It is approximately 265 miles north of San Francisco. Known for its well-preserved Victorian architecture and small-town ambiance, Ferndale is a popular tourist destination on the northern California coast.