Auburn National Bancorporation (AUBN) 8-K Departure of Directors or Certain Officers

Exhibit 99.1

December 11, 2018

The Board of Directors

Auburn National Bancorporation, Inc.

AuburnBank

100 North Gay Street, P.O. Drawer 3110,

Auburn, Alabama 36831

Ladies and Gentlemen:

I am retiring today as a member of the Board of Directors of Auburn National Bancorporation, Inc. (the “Company”) and as a member of the Board of Directors of AuburnBank (the “Bank”).

It has been a pleasure and a privilege serving the Company and the Bank. I am proud of the Company and the Bank, its management and its employees and all they have accomplished over the years.

I have no disagreements with the Company, the Bank or their management, board of directors or any of their board committees.

Sincerely,

E. L. Spencer, Jr.