High Quality Content by WIKIPEDIA articles! Huntington Beach is a seaside city in Orange County in Southern California. According to the 2010 census, the city population was 189,992; making it the largest beach city in Orange County in terms of population. It is bordered by the Pacific Ocean on the southwest, by Seal Beach on the northwest, by Costa Mesa on the east, by Newport Beach on the southeast, by Westminster on the north, and by Fountain Valley on the northeast.