Residents are advised that they may receive official looking mailings from companies offering to obtain a copy of their deed for an inflated cost. Should you need a copy of your deed, one can easily be obtained from the Nassau County Clerk’s office. You may request a copy in person or by mail. The Nassau County Clerk’s Office is located at 240 Old Country Road, Mineola, New York, 11501. Cost of a certified copy of your deed is $5.00 in person or $10.00 by mail.