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one
One.
91 cents or 3 stamps of 44 cents ea.
One ounce letter, one stamp.
If it's not excessively heavy or thick, just one.
41¢, the same as any 1st-class letter within the U.S.
Postage is based on weight, not distance. A one ounce letter is one stamp.
Since both GA and CA are in the US you would only need one 42 cent stamp. Don't be stupid.
Any stamp or stamps adding up to 42 cents if the letter is a normal size and does not weigh more than 1 ounce. www.usps.gov
If this is just a post card you will only need the one stamp to mail it within the US.
Just one stamp is needed! But it does have to be the right denomination. Currently a single ounce cost 44 cents.
As long as your letter is under an ounce it is just one stamp no matter which US state you are mailing a letter to.