Automated Postal Center - Madison 990 Highway 51 Madison, MS 39110 Phone : (601) 853-2403 Business Category Automated Postal Centers Toll-Free           (800) ASK-USPS Fax           (601) 898-4774 Post Office - Madison 990 Highway 51 Madison, MS 39110 Phone : (601) 853-2403 Business Category Post Offices Toll-Free           (800) ASK-USPS Fax           (601) 898-4774