EXHIBIT 11 FIRST KEYSTONE CORPORATION COMPUTATION OF EARNINGS PER COMMON SHARE Six Month Period Ended June 30, 2001 and 2000 (Dollars in Thousands) 2001 2000 <s> <c> <c> Primary Net Income $ 2,447 $ 2,481 Shares Weighted average number of common shares outstanding 2,833,727 2,833,727 Adjustments - increases or decreases None None Weighted average number of common shares outstanding as adjusted 2,833,727 2,833,727 Primary earnings per common share $ .86 $ .88 Assuming full dilution Net Income $ 2,447 $ 2,481 Shares Weighted average number of common shares outstanding 2,833,727 2,833,727 Adjustments - increases or decreases None None Weighted average number of common shares outstanding as adjusted 2,833,727 2,833,727 Earnings per common share assuming full dilution $ .86 $ .88