<P> Virtually all these locations are actually exteriors on the backlot of the Warner Bros. studio lot in Burbank . Interior scenes are filmed separately on nearby soundstages . For example, different sides of the same building on the backlot are used for the entrances of the Rosewood police station and high school . </P> <Ul> <Li> Real towns: New York City, Cape May, Philadelphia, London, Hilton Head Island and Brookhaven . </Li> </Ul> <Li> Real towns: New York City, Cape May, Philadelphia, London, Hilton Head Island and Brookhaven . </Li> <P> Pretty Little Liars premiered on June 8, 2010 in the United States, becoming ABC Family's highest - rated series debut on record across the network's target demographics . It ranked number one in key 12--34 demos and teens, becoming the number - one scripted show in Women 18--34, and Women 18--49 . The premiere was number two in the hour for total viewers, which generated 2.47 million unique viewers, and was ABC Family's best delivery in the time slot since the premiere of The Secret Life of the American Teenager . </P>

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