List of US Post Office Stores in Manassas Park, VA Outlet Note Regular Brands US Post Office Virginia Manassas Park Rating 4.5 based on 76 votes Official Website https://www.usps.com/ Products Postal Service NameAddressPhone Name/Address/Phone US Post Office outlet - Manassas Park 2049 Old Centreville Rd (703) 392-3955 People Also Viewed