Califrnia is in the Earth's western and northern hemispheres.
California is in the Northern and Western Hemisphere.
The US is in the Northern and Western Hemisphere.
The hemisphere that is south of California is the Southern Hemisphere.
California is located in the northern hemisphere.
All of the US is 100% in the northern hemisphere. In addition, ALMOST but not all of the US is in the western hemisphere, and the remaining little bit is in the eastern one.
California is in the northern hemisphere :P
Australia in East Hemisphere. Those who think this is not the correct answer may correct me.
California is in the northern and western hemispheres, but where you reside isn't clear from the question.
Western Hemisphere
Baja California is in the Western Hemisphere.
I currently reside in California.
I could reside in any darn hemisphere I choose. Right now, I reside in the northern and western ones, but that could change.