United States Government--federal Information Center, Post Office Callahan, FL 32011 Phone : (904) 879-2131 Business Category Government Offices-Federal Post Offices Government Offices & Public Schools United States Government--post Office, Callahan Hilliard, FL 32046 Phone : (904) 879-2131 Business Category Post Offices Government Offices & Public Schools Post Office - Callahan 450054 State Road 200 Callahan, FL 32011 Phone : (904) 879-2131 Post Office - Callahan Business Category Post Offices Toll-Free           (800) ASK-USPS Fax           (904) 879-6737