The Hangover was filmed in Las Vegas in the United States of America.
Locations
Chapel
Real
In movie
Fremont Street (between 9th & 10th)
Real
In movie
Jade's Apartment
Real
In movie
Hotel
Scene where The boys stay at the Caesar Palace for the bachelor party weekend. The lobby, elevator, hallways and entrance were used for filming.
Scene was shot at the famous Caesar's Palace Hotel, where they filmed scenes in the lobby, outside the hotel and on the roof.