Dayton is a small unincorporated community in Butte County, California. Its zip code is 95928 and its area code is 530. It lies at an elevation of 141 feet .HistoryThe Grainland post office was established in 1867 and closed later that year; it was reopened in 1873, closed again in 1892, reopened in 1893, and closed for good in 1902.GovernmentCountyStateThe citizens of Dayton, as constituents of California's 3rd Assembly District, are represented by in the California State Assembly. As constituents of California's 4th Senate District, they are represented by.FederalDayton is in.