United States Government--post Office, For Zip Code Information Galva, IA 51020 Phone : (712) 282-4782 Business Category Government Offices-Federal Post Offices Government Offices & Public Schools Post Office - Galva 120 S Main St Galva, IA 51020 Phone : (712) 282-4782 Business Category Post Offices Toll-Free           (800) ASK-USPS United States Government--post Office 120 S Main St Alta, IA 51002 Phone : (712) 282-4782 United States Government--post Office Business Category Government Offices-Federal Post Offices Government Offices & Public Schools