Casa Conejo is an unincorporated county island in Newbury Park, Ventura County, California, United States. It was the first planned community in Newbury Park, with construction beginning in 1960. When the city of Thousand Oaks incorporated 4 years later, the new developments in Newbury Park were included within the city boundaries before being subdivided. The community is bordered by Old Conejo Road and US 101 to the north, Borchard Road to the south, Jenny Drive to the west, and Sequoia Middle School to the east. For statistical purposes, the United States Census Bureau defines Casa Conejo as a census-designated place (CDP), though this definition may not exactly correspond to local understanding of the area. The population was 3,267 at the 2020 census, up from 3,249 at the 2010 census. Casa Conejo occupies a roughly rectangular unincorporated area surrounded by the city of Thousand Oaks.