How much does it cost to send a letter in first class mail?

As of January 2023, the cost to send a letter via First-Class Mail in the United States is 63 cents for a standard letter weighing up to one ounce. Additional ounces cost 24 cents each. Prices may vary based on factors like the size of the letter or any additional services selected. It's always advisable to check the United States Postal Service (USPS) website for the most current rates.