Offerman's Island

John and Dorothea Offerman had fours sons in about 1868 when they moved from a farm between Slopertown road and Harrison street northwest of Davenport, Iowa, United States, and bought then Credit Island and renamed it Offerman's Island.

In 1894 the county land ownership maps still showed John as the owner of Credit Island.

History
Offerman's Island was part of Rockingham Township in Scott County, Iowa, United States. Named Credit Island before the purchase it was also named Suburban Island, Grand Island and Manhattan Island.