Marmo-lejo Flats is a flat located in San Luis Obispo County, California. It appears on the Pebblestone Shut-in USGS 7.5-minute topographic quadrangle. The elevation at this location is approximately 1,662.27 feet (506.66 m) above sea level. The nearest populated place is San Simeon, approximately 5.0 miles to the WSW.