Post Office - Mapleton 106 S 5th St Mapleton, IA 51034 Phone : (712) 882-2545 Post Office - Mapleton Business Category Post Offices Toll-Free           (800) ASK-USPS United States Government--post Office 106 S 5th St Mapleton, IA 51034 Phone : (712) 882-2545 United States Government--post Office Business Category Government Offices-Federal Post Offices Government Offices & Public Schools United States Government--post Office, For Zip Code Information Mapleton, IA 51034 Phone : (712) 882-2545 Business Category Government Offices-Federal Post Offices Government Offices & Public Schools