Sycamore Flat is an unincorporated community in Monterey County, California. It is located on Arroyo Seco 9mi west-southwest of Greenfield, at an elevation of 617 feet (188 m).The Arroyo Seco (Salinas River) flows beside Sycamore Flat.GovernmentAt the county level, Sycamore Flat is represented on the Monterey County Board of Supervisors by Supervisor Dave Potter.In the California State Legislature, Sycamore Flat is in, and in.In the United States House of Representatives, Sycamore Flat is in