Avalon is the only incorporated city on Santa Catalina Island, in the California Channel Islands, and the southernmost city in Los Angeles County. The city is a resort community with the waterfront dominated by tourism-oriented businesses. The older parts of the town on the valley floor consist primarily of small houses and two and three-story buildings in various traditional architectural styles.

SS Catalina, also known as The Great White Steamer, was a 301-foot steamship built in 1924 that provided passenger service on the 26-mile passage between Los Angeles and Santa Catalina Island from 1924 to 1975. According to the Steamship Historical Society of America, Catalina has carried more passengers than any other vessel anywhere. From August 25, 1942, until April 22, 1946, the ship served as the Army troop ferry U.S. Army FS-99 at the San Francisco Port of Embarkation transporting more than 800,000 troops and other military personnel between embarkation camps and the departure piers. After a period of service as a floating discothèque, the ship ran aground on a sandbar in Ensenada Harbor in 1997 and partially sank on the spot. It was scrapped in 2009.