United States Government--post Office, Day Florida Highway 53 Mayo, FL 32066 Phone : (386) 294-2290 Business Category Post Offices Government Offices & Public Schools Post Office - Day 4573 N County Road 53 Mayo, FL 32066 Phone : (386) 294-2290 Business Category Post Offices Toll-Free           (800) ASK-USPS Fax           (904) 294-2290 United States Postal Service , Phone : (386) 294-2290 United States Postal Service Business Category