Lompoc is a city in Santa Barbara County, California, on the west coast of the United States. The city was incorporated on August 13, 1888. The population was 42,434 at the 2010 census, up from 41,103 at the 2000 census. Before European settlers arrived, the area around Lompoc was inhabited by the Chumash people. The name of the city is derived from a Chumashan term, "Lum Poc", which means "stagnant waters" or "lagoon". The Spanish called it "Lumpoco".