The Iowa Territory Census at that time consisted of the following counties:
Cedar, Clayton, Clinton, Delaware, Des Moines,
Dubuque, Henry, Jackson, Jefferson, Johnson, Jones, Lee, Linn, Louisa,
Muscatine, Scott, Van Buren, and Washington.
The census can be accessed by 2 different means.
2. 1840 census by surname. Alphabetical list.
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