California (USA) is 7% larger than Montana (USA).
Area: 403,466 km2 US Census
Population: 38,332,521 (July 2013) US Census
California is a state located on the West Coast of the United States. It is the most populous U.S. state, home to one out of eight Americans, and is the third largest state by area. Wikipedia
Area: 376,962 km2 US Census
Population: 1,015,165 (July 2013) US Census
Montana is a state in the Western United States. The state's name is derived from the Spanish word montaña. Wikipedia