Post Office - Avoca 140 Sw 2nd St Avoca, MN 56114 Phone : (507) 335-7842 Post Office - Avoca Business Category Post Offices Toll-Free           (800) ASK-USPS United States Government--post Office 140 Sw 2nd St Avoca, MN 56114 Phone : (507) 335-7842 Business Category Government Offices-Federal Post Offices Government Offices & Public Schools