Hills Flat is a neighborhood of Grass Valley, California, United States, formerly an unincorporated community of Nevada County. It lies at an elevation of 2457 feet. A former crossroads, Hills Flat became a self-sufficient community in the era of automobile travel, with utilities, several businesses, and a rapidly growing population as of 1932. A referendu…Hills Flat is a neighborhood of Grass Valley, California, United States, formerly an unincorporated community of Nevada County. It lies at an elevation of 2457 feet. A former crossroads, Hills Flat became a self-sufficient community in the era of automobile travel, with utilities, several businesses, and a rapidly growing population as of 1932. A referendum on annexation by Grass Valley was held in 1934, and was rejected. Hills Valley residents ultimately voted to join Grass Valley in 1967. Today, Hills Flat is considered a "business district" of Grass Valley, best known for its large lumber yard.
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