Big Lagoon is a census-designated site in Humboldt County, California. Located seven miles (11 km) north of Trinidad, it rises 56 feet (17 m) above sea level. Its population was 161 in the 2020 census, up from 93 in 2010. Big Lagoon, California, offers a serene and picturesque setting for outdoor enthusiasts and nature lovers to explore and admire the natural wonders of the North Coast.