We have renewal templates for: 90 Days Out, 15 Days Out, Day of Expiration. 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. Deadlines vary, so check your admit letter for your deadline. Thank you for becoming a member of the Suffolk family! Here at your credit union, we're about more than just banking,. The PDF version of these forms are FILLABLE. They can be filled out electronically, then printed. Fill out the Application Form. Trying to write a membership renewal letter but don't know where to start?