One will do the job on a first class letter of the correct size and shape as long as it weighs one ounce or less within the US.
one 44c stamp
one
you would only need one stamp
One if it is for the correct amount or greater in postage due.
You will need one .44 cent stamp for a standard one ounce letter.
You will need one .44 cent stamp for a standard one ounce letter.
One if the amount is correct or greater than the postage due.
If it just a letter, just one is fine no matter where you send it from and where the ending destination is located. But I think it cannot exceed a certain weight. If you are concerned about it put two stamps on the envelope and mail it out.
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.
Enough to add up to the cost of postage. Currently a first class letter of one ounce is 44 cents.
one
One.