To get your address change processed faster, log in to Online Services and select Business change of address. Welcome to the Suffolk County Clerk's Office.At one time or another either directly or indirectly, every resident of Suffolk County deals with our office. To change your physical or mailing address, complete Form DTF96, Report of Address Change for Business Tax Accounts. Mail to: Suffolk County Treasurer. Change of Address Form - Tax Roll. This form is to be used if you require a change of address. Please complete th infqrmation change form below_and submit. It does not change ownership. I recently moved and filled out the change of address form with my new address and associated residency codes.