Automated Postal Center - Dulles Finance Unit 44715 Prentice Dr Dulles, VA 20101 Phone : (703) 406-6290 Business Category Automated Postal Centers Toll-Free           (800) ASK-USPS Fax           (703) 406-6253 Post Office - Dulles Finance Unit 44715 Prentice Dr Dulles, VA 20101 Phone : (703) 406-6290 Business Category Post Offices Toll-Free           (800) ASK-USPS Fax           (703) 406-6253