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Just one. It has to be worth 42 cents. That is the rate for first class mail anywhere in the U.S. You can also use any combination of stamps that add up to 42 cents. Stamps come in many denominations from one cent on up. Asking "how many stamps" is like asking "how many coins for a candy bar?" It depends on the value of the coins.

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17y ago

What else can I help you with?