United States Government--post Offices, Elvaston Elvaston, IL 62334 Phone : (217) 845-3116 Business Category Government Offices-Federal Post Offices Government Offices & Public Schools Post Office - Elvaston 104 W Maine St Elvaston, IL 62334 Phone : (217) 845-3116 Post Office - Elvaston Business Category Post Offices Toll-Free           (800) ASK-USPS