as 22.9% under the age of 18, 6.7% aged 18 to 24, 24.2% aged 25 to 44, 28.1% aged 45 to 64, and 18.0% who were 65 years of age or older. The median age was 40.7 years. For every 100 females, there were 105.3 males. For every 100 females age 18 and over, there were 102.3 males. The 301 housing units averaged 377.8 per square mile (145.9/km2), of which 44.2% were owner-occupied, and 55.8% were occupied by renters. The homeowner vacancy rate was 2.2%; the rental vacancy rate was 11.3%; 31.0% of the population lived in owner-occupied housing units and 68.8% lived in rental housing units. Infrastructure The San Simeon Community Services District provides wastewater treatment. The plant is operated by a private company under contract with the district. References External links Chamber of Commerce History of San Simeon and the Hearst Family History of San Simeon and Sebastian store San Simeon pier on Photohound Census-designated places in San Luis Obispo County, California Populated coastal places in California Census-designated places in California