| County
|
FIPS-Code[1]
|
County Sitz
|
Grindung
|
Uasprung
|
Namasheakunft
|
Einwohna
2010[2]
|
Fläche[3]
|
Koatn
|
| Adair
|
001
|
Greenfield
|
1851
|
Cass County
|
John Adair (1757–1840)
|
7.682
|
1.474 km²
|
|
| Adams
|
003
|
Corning
|
1851
|
Taylor County
|
John Adams
|
4.029
|
1.098 km²
|
![]()
|
| Allamakee
|
005
|
Waukon
|
1847
|
Clayton County
|
Allen Magee
|
14.330
|
1.658 km²
|
|
| Appanoose
|
007
|
Centerville
|
1843
|
Davis County
|
Appanoose, Indianahaiptling
|
12.887
|
1.285 km²
|
|
| Audubon
|
009
|
Audubon
|
1851
|
Black Hawk County und Cass County
|
John James Audubon
|
6.119
|
1.147 km²
|
|
| Benton
|
011
|
Vinton
|
1837
|
Indianerland und Wisconsin-Territorium
|
Thomas Hart Benton
|
26.076
|
1.854 km²
|
|
| Black Hawk
|
013
|
Waterloo
|
1843
|
Delaware County
|
Black Hawk (1767–1838)
|
131.090
|
1.469 km²
|
|
| Boone
|
015
|
Boone
|
1847
|
Polk County
|
Nathan Boone (1781–1863)
|
26.306
|
1.481 km²
|
|
| Bremer
|
017
|
Waverly
|
1853
|
Indianerland und Winnebago County
|
Fredrika Bremer (1801–1865)
|
24.276
|
1.109 km²
|
|
| Buchanan
|
019
|
Independence
|
1837
|
Delaware County und Wisconsin-Territorium
|
James Buchanan
|
20.958
|
1.479 km²
|
|
| Buena Vista
|
021
|
Storm Lake
|
1851
|
Clay County und Sac County
|
Schlacht vo Buena Vista
|
20.260
|
1.489 km²
|
|
| Butler
|
023
|
Allison
|
1851
|
Black Hawk County und Buchanan County
|
William Orlando Butler (1791–1880)
|
14.867
|
1.502 km²
|
|
| Calhoun
|
025
|
Rockwell City
|
1851
|
Fox County (umbenannt)
|
John C. Calhoun
|
9.670
|
1.476 km²
|
|
| Carroll
|
027
|
Carroll
|
1851
|
Guthrie County
|
Charles Carroll (1737–1832)
|
20.816
|
1.474 km²
|
|
| Cass
|
029
|
Atlantic
|
1851
|
Pottawattamie County
|
Lewis Cass
|
13.956
|
1.461 km²
|
|
| Cedar
|
031
|
Tipton
|
1837
|
Wisconsin-Territorium
|
Red Cedar River
|
18.499
|
1.502 km²
|
|
| Cerro Gordo
|
033
|
Mason City
|
1851
|
Floyd County
|
Schlacht vo Cerro Gordo
|
44.151
|
1.471 km²
|
|
| Cherokee
|
035
|
Cherokee
|
1851
|
Crawford County
|
De Cherokee
|
12.072
|
1.494 km²
|
|
| Chickasaw
|
037
|
New Hampton
|
1851
|
Fayette County
|
De Chickasaw
|
12.439
|
1.308 km²
|
|
| Clarke
|
039
|
Osceola
|
1846
|
Lucas County
|
James Clarke
|
9.286
|
1.116 km²
|
|
| Clay
|
041
|
Spencer
|
1851
|
Indianerland
|
Henry Clay, Jr. (1807–1847)
|
16.667
|
1.474 km²
|
|
| Clayton
|
043
|
Elkader
|
1837
|
Dubuque County und Wisconsin-Territorium
|
John M. Clayton (1796–1856)
|
18.129
|
2.018 km²
|
|
| Clinton
|
045
|
Clinton
|
1837
|
Dubuque County und Wisconsin-Territorium
|
DeWitt Clinton (1769–1828)
|
49.116
|
1.800 km²
|
|
| Crawford
|
047
|
Denison
|
1851
|
Shelby County
|
William Harris Crawford (1772–1834)
|
17.096
|
1.849 km²
|
|
| Dallas
|
049
|
Adel
|
1846
|
Polk County
|
George Mifflin Dallas (1792–1864)
|
66.135
|
1.518 km²
|
|
| Davis
|
051
|
Bloomfield
|
1843
|
Van Buren County
|
Garrett Davis (1801–1872)
|
8.753
|
1.303 km²
|
|
| Decatur
|
053
|
Leon
|
1846
|
Appanoose County
|
Stephen Decatur (1779–1820)
|
8.457
|
1.378 km²
|
|
| Delaware
|
055
|
Manchester
|
1837
|
Dubuque County und Wisconsin-Territorium
|
Delaware
|
17.764
|
1.497 km²
|
|
| Des Moines
|
057
|
Burlington
|
1834
|
Michigan-Territorium und Wisconsin-Territorium
|
Des Moines River
|
40.325
|
1.077 km²
|
|
| Dickinson
|
059
|
Spirit Lake
|
1851
|
Kossuth County
|
Daniel S. Dickinson (1800–1866)
|
16.667
|
987 km²
|
|
| Dubuque
|
061
|
Dubuque
|
1834
|
Michigan-Territorium und Wisconsin-Territorium
|
Julien Dubuque (1762–1810)
|
93.653
|
1.575 km²
|
|
| Emmet
|
063
|
Estherville
|
1851
|
Dickinson County und Kossuth County
|
Robert Emmet (1778–1803)
|
10.302
|
1.026 km²
|
|
| Fayette
|
065
|
West Union
|
1837
|
Clayton County und Wisconsin-Territorium
|
Marquis de Lafayette (1757–1834)
|
20.880
|
1.893 km²
|
|
| Floyd
|
067
|
Charles City
|
1851
|
Chickasaw County
|
Charles Floyd (1782–1804)
|
16.303
|
1.298 km²
|
|
| Franklin
|
069
|
Hampton
|
1851
|
Chickasaw County
|
Benjamin Franklin (1706–1790)
|
10.680
|
1.507 km²
|
|
| Fremont
|
071
|
Sidney
|
1847
|
Pottawattamie County
|
John Charles Fremont (1813–1890)
|
7.441
|
1.323 km²
|
|
| Greene
|
073
|
Jefferson
|
1851
|
Dallas County
|
Nathanael Greene (1742–1786)
|
9.336
|
1.471 km²
|
|
| Grundy
|
075
|
Grundy Center
|
1851
|
Black Hawk County
|
Felix Grundy (1777–1840)
|
12.453
|
1.303 km²
|
|
| Guthrie
|
077
|
Guthrie Center
|
1851
|
Jackson County
|
Edwin B. Guthrie
|
10.954
|
1.531 km²
|
|
| Hamilton
|
079
|
Webster City
|
1856
|
Webster County
|
William W. Hamilton
|
15.673
|
1.494 km²
|
|
| Hancock
|
081
|
Garner
|
1851
|
Wright County
|
John Hancock (1737–1793)
|
11.341
|
1.479 km²
|
|
| Hardin
|
083
|
Eldora
|
1851
|
Black Hawk County
|
John J. Hardin (1810–1847)
|
17.534
|
1.474 km²
|
|
| Harrison
|
085
|
Logan
|
1851
|
Pottawattamie County
|
William H. Harrison (1773–1841)
|
14.928
|
1.805 km²
|
|
| Henry
|
087
|
Mount Pleasant
|
1836
|
Wisconsin-Territorium
|
Henry Dodge (1782–1867)
|
20.145
|
1.124 km²
|
|
| Howard
|
089
|
Cresco
|
1851
|
Chickasaw County
|
Tilghman Ashurst Howard (1797–1844)
|
9.566
|
1.225 km²
|
|
| Humboldt
|
091
|
Dakota City
|
1857
|
Webster County
|
Alexander von Humboldt (1769–1859)
|
9.815
|
1.124 km²
|
|
| Ida
|
093
|
Ida Grove
|
1851
|
Cherokee County
|
Idagebirge in Griachaland
|
7.089
|
1.119 km²
|
|
| Iowa
|
095
|
Marengo
|
1843
|
Washington County
|
Iowa River
|
16.355
|
1.518 km²
|
|
| Jackson
|
097
|
Maquoketa
|
1837
|
Wisconsin-Territorium
|
Andrew Jackson (1767–1845)
|
19.848
|
1.647 km²
|
|
| Jasper
|
099
|
Newton
|
1846
|
Mahaska County
|
William Jasper (1750–1779)
|
36.842
|
1.891 km²
|
|
| Jefferson
|
101
|
Fairfield
|
1839
|
Indianerland
|
Thomas Jefferson (1743–1826)
|
16.843
|
1.127 km²
|
|
| Johnson
|
103
|
Iowa City
|
1837
|
Des Moines County und Wisconsin-Territorium
|
Richard M. Johnson (1780–1850)
|
130.882
|
1.590 km²
|
|
| Jones
|
105
|
Anamosa
|
1837
|
Wisconsin-Territorium
|
George W. Jones (1804–1896)
|
20.638
|
1.489 km²
|
|
| Keokuk
|
107
|
Sigourney
|
1837
|
Washington County
|
Keokuk (1767–1848), Haiptling
|
10.511
|
1.500 km²
|
|
| Kossuth
|
109
|
Algona
|
1851
|
Webster County
|
Lajos Kossuth (1802–1894)
|
15.543
|
2.520 km²
|
|
| Lee
|
111
|
Fort Madison und Keokuk
|
1851
|
Des Moines County
|
entweder William Elliott Lee
|
35.862
|
1.339 km²
|
|
| Linn
|
113
|
Cedar Rapids
|
1837
|
Wisconsin-Territorium
|
Lewis F. Linn (1795–1843)
|
211.226
|
1.860 km²
|
|
| Louisa
|
115
|
Wapello
|
1836
|
Des Moines County
|
Louisa in Virginia
|
11.387
|
1.041 km²
|
|
| Lucas
|
117
|
Chariton
|
1846
|
Monroe County
|
Robert Lucas (1781–1853)
|
8.898
|
1.116 km²
|
|
| Lyon
|
119
|
Rock Rapids
|
1851
|
Woodbury County
|
Nathaniel Lyon (1818–1861)
|
11.581
|
1.523 km²
|
|
| Madison
|
121
|
Winterset
|
1846
|
Polk County
|
James Madison (1751–1836)
|
15.679
|
1.453 km²
|
|
| Mahaska
|
123
|
Oskaloosa
|
1843
|
Indianerland der Sauk und Fox
|
Mahaska (1784–1834), Haiptling
|
22.381
|
1.479 km²
|
|
| Marion
|
125
|
Knoxville
|
1845
|
Washington County
|
Francis Marion (1732–1795)
|
33.309
|
1.435 km²
|
|
| Marshall
|
127
|
Marshalltown
|
1846
|
Jasper County
|
John Marshall (1755–1835)
|
40.648
|
1.481 km²
|
|
| Mills
|
129
|
Glenwood
|
1851
|
Pottawattamie County
|
Frederick Mills
|
15.059
|
1.132 km²
|
|
| Mitchell
|
131
|
Osage
|
1851
|
Chickasaw County
|
John Mitchel (1815–1875)
|
10.776
|
1.215 km²
|
|
| Monona
|
133
|
Onawa
|
1851
|
Harrison County
|
Monona
|
9.243
|
1.795 km²
|
|
| Monroe
|
135
|
Albia
|
1843
|
Wapello County
|
James Monroe (1758–1831)
|
7.970
|
1.121 km²
|
|
| Montgomery
|
137
|
Red Oak
|
1851
|
Polk County
|
Richard Montgomery (1738–1775)
|
10.740
|
1.098 km²
|
|
| Muscatine
|
139
|
Muscatine
|
1836
|
Des Moines County
|
Indianerstamm vo de Mascouten
|
42.745
|
1.137 km²
|
|
| O'Brien
|
141
|
Primghar
|
1851
|
Cherokee County
|
William Smith O'Brien (1803–1864)
|
14.398
|
1.484 km²
|
|
| Osceola
|
143
|
Sibley
|
1871
|
Woodbury County
|
Osceola (1804–1838), Haiptling
|
6.462
|
1.033 km²
|
|
| Page
|
145
|
Clarinda
|
1847
|
Pottawattamie County
|
John Page
|
15.932
|
1.386 km²
|
|
| Palo Alto
|
147
|
Emmetsburg
|
1851
|
Kossuth County
|
Schlacht vo Palo Alto
|
9.421
|
1.461 km²
|
|
| Plymouth
|
149
|
Le Mars
|
1851
|
Woodbury County
|
Plymouth in Massachusetts
|
24.986
|
2.238 km²
|
|
| Pocahontas
|
151
|
Pocahontas
|
1851
|
Greene County und Humboldt County
|
Pocahontas (1595–1618), "Indianaprinzessin" aus Virginia
|
7.310
|
1.497 km²
|
|
| Polk
|
153
|
Des Moines
|
1846
|
Indianerland
|
James K. Polk (1795–1849)
|
430.640
|
1.476 km²
|
|
| Pottawattamie
|
155
|
Council Bluffs
|
1847
|
Indianerland
|
Indianastamm vo de Potawatomi
|
93.158
|
2.471 km²
|
|
| Poweshiek
|
157
|
Montezuma
|
1843
|
Indianerland des Stammes der Fox
|
Poweshiek, Haiptling
|
18.914
|
1.515 km²
|
|
| Ringgold
|
159
|
Mount Ayr
|
1847
|
Taylor County
|
Samuel Ringgold (1796–1846)
|
5.131
|
1.393 km²
|
|
| Sac
|
161
|
Sac City
|
1851
|
Greene County
|
Indianerstamm vo de Sauk (auch Sac)
|
10.350
|
1.492 km²
|
|
| Scott
|
163
|
Davenport
|
1837
|
Wisconsin-Territorium
|
Winfield Scott (1786–1866)
|
165.224
|
1.186 km²
|
|
| Shelby
|
165
|
Harlan
|
1851
|
Cass County
|
Isaac Shelby (1750–1826)
|
12.167
|
1.531 km²
|
|
| Sioux
|
167
|
Orange City
|
1851
|
Plymouth County
|
Indianerstamm vo de Sioux
|
33.704
|
1.989 km²
|
|
| Story
|
169
|
Nevada
|
1846
|
Boone County, Jasper County und Polk County
|
Joseph Story (1779–1845)
|
89.542
|
1.484 km²
|
|
| Tama
|
171
|
Toledo
|
1843
|
Benton County und Boone County
|
entweda Taimah Haiptling, Taomah (Frau vom Haiptling Poweshiek) oda Haiptling Potama
|
17.767
|
1.867 km²
|
|
| Taylor
|
173
|
Bedford
|
1847
|
Page County
|
Zachary Taylor
|
6.317
|
1.383 km²
|
|
| Union
|
175
|
Creston
|
1851
|
Clarke County
|
"Die Union"
|
12.534
|
1.098 km²
|
|
| Van Buren
|
177
|
Keosauqua
|
1836
|
Des Moines County
|
Martin Van Buren (1782–1862)
|
7.570
|
1.256 km²
|
|
| Wapello
|
179
|
Ottumwa
|
1843
|
Indianerland
|
Wapello, Häuptling der Fox
|
35.625
|
1.119 km²
|
|
| Warren
|
181
|
Indianola
|
1846
|
Polk County
|
Joseph Warren (1741–1775)
|
46.225
|
1.481 km²
|
|
| Washington
|
183
|
Washington
|
1839
|
Wisconsin-Territorium
|
George Washington (1732–1799)
|
21.704
|
1.474 km²
|
|
| Wayne
|
185
|
Corydon
|
1846
|
Appanoose County
|
Anthony Wayne (1745–1796)
|
6.403
|
1.362 km²
|
|
| Webster
|
187
|
Fort Dodge
|
1853
|
Risley County und Yell County, (aufglest)[4]
|
Daniel Webster (1782–1852)
|
38.013
|
1.852 km²
|
|
| Winnebago
|
189
|
Forest City
|
1851
|
Kossuth County
|
Indianerstamm vo de Winnebago
|
10.866
|
1.036 km²
|
|
| Winneshiek
|
191
|
Decorah
|
1847
|
Indianerland
|
Winneshiek, Haiptling
|
21.056
|
1.787 km²
|
|
| Woodbury
|
193
|
Sioux City
|
1853
|
Polk County
|
Levi Woodbury (1789–1851)
|
102.172
|
2.261 km²
|
|
| Worth
|
195
|
Northwood
|
1851
|
Mitchell County
|
William Jenkins Worth (1794–1849)
|
7.598
|
1.036 km²
|
|
| Wright
|
197
|
Clarion
|
1851
|
Webster County und Kossuth County
|
Silas Wright (1795–1847)
|
13.229
|
1.505 km²
|
|
