United States Government--post Offices, Tarkio Tarkio, MO 64491 Phone : (660) 736-4257 Business Category Government Offices-Federal Post Offices Government Offices & Public Schools Post Office - Tarkio 505 Main St Tarkio, MO 64491 Phone : (660) 736-4257 Post Office - Tarkio Business Category Post Offices Toll-Free           (800) ASK-USPS Fax           (660) 736-5768 United States Postal Service , Phone : (660) 736-4257 United States Postal Service Business Category