Rossmoor is a planned census-designated place located in Orange County, California. As of the 2020 census, the CDP had a total population of 10,625 up from the 2010 census population of 10,244.Living in Rossmoor offers residents a sparse suburban feel and most residents own their homes. In Rossmoor there are a lot of restaurants, coffee shops, and parks. Many retirees live in Rossmoor and residents tend to lean liberal. The public schools in Rossmoor are highly rated.