Post Office - Harris 444 Railway St Harris, MO 64645 Phone : (660) 794-5295 Business Category Post Offices Toll-Free           (800) ASK-USPS Post Office - Newtown 109 S Main St Newtown, MO 64667 Phone : (660) 794-5295 Post Office - Newtown Business Category Post Offices Toll-Free           (800) ASK-USPS