Two (2) forms of proof of address must accompany your application. Complete the application on the Certificate of Residency website. 2.Such person shall, upon his registration for each college year, file with the college such Certificate of Residence issued not earlier than two months prior. Students can easily apply for. Once processed, the certificate of residence will be mailed to you. Submit the affidavit to your county with two (2) of the following documents as proof of residency. Suffolk county asks for proof of residence in the form of a utility bill, tax bill, or voter registration card. It will not be issued for any other purpose.