You cannot list a po box on your license or state ID. A lease or mortgage document will have the street address. A post office box is never an acceptable address for the purpose of determining residency.Mail: Licensing Specialist. Look up your home county information below and complete the associated Certificate of Residence Affidavit and Application. Select the "Submit Your Certificate of Residency" link and follow the instructions for your County. You may also mail the original to: SUNY Broome PO Box 1017