Iowa Ornithologists' Union
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State List: 432 species
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Adair
Adams
Allamakee
Appanoose
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Benton
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Boone
Bremer
Buchanan
Buena Vista
Butler
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Cass
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Chickasaw
Clarke
Clay
Clayton
Clinton
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Delaware
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Dubuque
Emmet
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Guthrie
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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
IOU members may login and update county lists.