Iowa

Admitted to the Union on December 28, 1846 as the 28th state. Iowa became a territory in 1838.

  • 1840—1940 federal censuses extant for all counties except for 1890.
Adair Adams Allamakee Appanoose
Audubon Benton Black Hawk Boone
Bremer Buchanan Buena Vista Butler
Calhoun Carroll Cass Cedar
Cerro Gordo Cherokee Chickasaw Clarke
Clay Clayton Clinton Crawford
Dallas Davis Decatur Delaware
Des Moines Dickinson Dubuque Emmet
Fayette Floyd Franklin Fremont
Greene Grundy Guthrie Hamilton
Hancock Hardin Harrison Henry
Howard Humboldt Ida Iowa
Jackson Jasper Jefferson Johnson
Jones Keokuk Kossuth Lee
Linn Louisa Lucas Lyon
Madison Mahaska Marion Marshall
Mills Mitchell Monona Monroe
Montgomery Muscatine O'Brien Osceola
Page Palo Alto Plymouth Pocahontas
Polk Pottawattamie Poweshiek Ringgold
Sac Scott Shelby Sioux
Story Tama Taylor Union
Van Buren Wapello Warren Washington
Wayne Webster Winnebago Winneshiek
Woodbury Worth Wright