Post Office - Downey 35 N Main St Downey, ID 83234 Phone : (208) 897-5755 Business Category Post Offices Toll-Free           (800) ASK-USPS United States Government--post Office 35 N Main St Downey, ID 83234 Phone : (208) 897-5755 Business Category Government Offices-Federal Post Offices Government Offices & Public Schools