The island of Kråkerøy was separated from Glemmen as a municipality of its own January 1, 1908. At that time Kråkerøy had a population of 3,311. 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.
- Dag Jukvam / Statistics Norway (1999). Historisk oversikt over endringer i kommune- og fylkesinndelingen.
- Kråkerøy at GEOnet Names Server
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