Automated Postal Center - Manchester 3100 Westminster St Manchester, MD 21102 Phone : (410) 374-0586 Business Category Automated Postal Centers Toll-Free           (800) ASK-USPS Fax           (410) 374-1558 Post Office - Manchester 3100 Westminster St Manchester, MD 21102 Phone : (410) 374-0586 Post Office - Manchester Business Category Post Offices Toll-Free           (800) ASK-USPS Fax           (410) 374-1558