Broome County OFFICE OF THE COUNTY CLERK Joseph A. Mihalko, County Clerk. Broome County Office Building, 3. rd. Floor • 60 Hawley Street • P.O. Box 2062 • Binghamton, NY 13902 (607) 778-2451 • www.gobcclerk.com • BroomeCountyClerk . Certificate of Doing Business Under an Assumed Name (D/B/A)