United States Government--post Office 214 Walnut St Arnold, NE 69120 Phone : (308) 848-2210 Business Category Government Offices-Federal Post Offices Government Offices & Public Schools Post Office - Arnold 214 S Walnut St Arnold, NE 69120 Phone : (308) 848-2210 Post Office - Arnold Business Category Post Offices Toll-Free           (800) ASK-USPS