The O.C. Filming Locations

The O.C. was filmed in Los Angeles & Las Vegas in United States of America.
Show Map
 

Paramount Ranch

From episode 4x01 "The Avengers".

Source: IMDb

 

El Royale Hotel

Ensenada Motel

From episode 4x02 "The Gringos".

Source: IMDb

Hard Rock Hotel and Casino

the kids go to Vegas and stay here