How much money does it cost to mail a 3 ounce letter from Texas to Louisiana?

As of my last update, mailing a 3-ounce letter within the U.S. using First-Class Mail costs $1.26. This includes the base rate for the first ounce and an additional charge for each extra ounce. However, postage rates can change, so it's advisable to check the USPS website or visit a local post office for the most current rates.