How many stamps to mail a three page letter from UT to CA?

To mail a three-page letter from Utah (UT) to California (CA), you would typically need one First-Class stamp if the total weight is under one ounce. If the letter exceeds one ounce, you would need additional stamps based on the weight. For the most accurate postage, it's best to check with the USPS website or a local post office for current rates and weight guidelines.