One regular 44-cent First Class stamp is all you need to send a letter anywhere inside the U.S. Additional postage is decided by the weight of the letter, not where it's coming from and going to.
A regular First Class stamp covers all letters that weigh up to one ounce. Letters weighing more than one ounce will require additional postage. See the Related Link below for more details.
typicaly 2 stamps
One.
6
About one liberty stamp :)
75 cents.
1
only one
For a regular letter? Just one.
Ask at a post office in USA !
Just 1. Hawaii is zone 8.
A single First Class stamp is adequate for a one ounce regular letter.
I depends on how much the letter weighs, 1 First Class stamp is good for 1 ounce.