United States Government--post Offices, Clifton Hill, For Zip Code Information Clifton Hill, MO 65244 Phone : (660) 261-4468 Business Category Government Offices-Federal Post Offices Government Offices & Public Schools Post Office - Clifton Hill 639 Harlan St Clifton Hill, MO 65244 Phone : (660) 261-4468 Business Category Government Offices-Federal Post Offices Government Offices & Public Schools Toll-Free           (800) ASK-USPS