United States Government--post Offices, Ethel, For Zip Code Information Ethel, MO 63539 Phone : (660) 486-3260 Business Category Government Offices-Federal Post Offices Government Offices & Public Schools Post Office - Ethel 102 W Main St Ethel, MO 63539 Phone : (660) 486-3260 Business Category Government Offices-Federal Post Offices Government Offices & Public Schools Toll-Free           (800) ASK-USPS