Ventura, officially named San Buenaventura, is a city in and the county seat of Ventura County, California, United States. It is a coastal city l…Ventura, officially named San Buenaventura, is a city in and the county seat of Ventura County, California, United States. It is a coastal city located northwest of Los Angeles. The population was 110,763 at the 2020 census. Ventura is a popular tourist destination, owing to its historic landmarks, beaches, and resorts.