The rural municipality was (together with Borge, Onsøy and Rolvsøy) merged with the city of Fredrikstad January 1, 1994. Prior to the merger Kråkerøy had a population of 7,445.
On January 1, 1994, the rural municipality of Kråkerøy merged with the city of Fredrikstad, along with Borge, Onsøy, and Rolvsøy. Before this merger, Kråkerøy had a population of 7,445.