List of counties in Iowa
County information
Table:
County

FIPS code[10]

County seat[4]

#

Established[4][11]

Formed from[12]

Etymology[11]
Map #

Population[13]

Area[4]

Map

Adair County

001

Greenfield
01
Jan 15, 1851
Cass County
John Adair, Kentucky Governor
69

7,682

569 sq mi
(1,474 km2)

Adams County

003

Corning
02
Jan 15, 1851
Taylor County
John Adams, US President
81

4,029

424 sq mi
(1,098 km2)

Allamakee County

005

Waukon
03
Feb 20, 1847
Clayton County
Disputed, possibly Allan Makee, early trader and guide for settlers
11

14,330

640 sq mi
(1,658 km2)

Appanoose County

007

Centerville
04
Feb 17, 1843
Davis County
Chief Appanoose, headed peace party in the Black Hawk War
96

12,884

496 sq mi
(1,285 km2)

Audubon County

009

Audubon
05
Jan 15, 1851
Black Hawk County and Cass County
John James Audubon, ornithologist and artist
57

6,119

443 sq mi
(1,147 km2)

Benton County

011

Vinton
06
Dec 21, 1837
Native American lands and Wisconsin Territory
Thomas Hart Benton, Missouri Senator
51

26,076

716 sq mi
(1,854 km2)

Black Hawk County

013

Waterloo
07
Feb 17, 1843
Delaware County
Black Hawk, leader during Black Hawk War
39

131,090

567 sq mi
(1,469 km2)

Boone County

015

Boone
08
Jan 13, 1846
Polk County
Nathan Boone, one of the first to survey Iowa
47

26,306

572 sq mi
(1,481 km2)

Bremer County

017

Waverly
09
Jan 15, 1851
Native American lands and Winnebago County
Fredrika Bremer, Swedish poet and author
30

24,276

428 sq mi
(1,109 km2)

Buchanan County

019

Independence
10
Dec 21, 1837
Delaware County and Wisconsin Territory
James Buchanan, US President
40

20,958

571 sq mi
(1,479 km2)

Buena Vista County

021

Storm Lake
11
Jan 15, 1851
Clay County and Sac County
Battle of Buena Vista, Mexican–American War
24

20,260

575 sq mi
(1,489 km2)

Butler County

023

Allison
12
Jan 15, 1851
Black Hawk County and Buchanan County
William Orlando Butler, War of 1812 hero
29

14,867

580 sq mi
(1,502 km2)

Calhoun County

025

Rockwell City
13
Jan 15, 1851
Fox County (renamed)
John C. Calhoun, US Vice President
34

9,670

570 sq mi
(1,476 km2)

Carroll County

027

Carroll
14
Jan 15, 1851
Guthrie County
Charles Carroll, signatory of the Declaration of Independence
45

20,816

569 sq mi
(1,474 km2)

Cass County

029

Atlantic
15
Jan 15, 1851
Pottawattamie County
Lewis Cass, Michigan Senator
68

13,956

564 sq mi
(1,461 km2)

Cedar County

031

Tipton
16
Dec 21, 1837
Wisconsin Territory
Cedar River that runs through county
65

18,499

580 sq mi
(1,502 km2)

Cerro Gordo County

033

Mason City
17
Jan 15, 1851
Floyd County
Battle of Cerro Gordo, Mexican–American War
17

44,151

568 sq mi
(1,471 km2)

Cherokee County

035

Cherokee
18
Jan 15, 1851
Crawford County
Cherokee People
23

12,072

577 sq mi
(1,494 km2)

Chickasaw County

037

New Hampton
19
Jan 15, 1851
Fayette County
Chickasaw People
19

12,439

505 sq mi
(1,308 km2)

Clarke County

039

Osceola
20
Jan 13, 1846
Lucas County
James Clarke, Governor of Iowa Territory
83

9,286

431 sq mi
(1,116 km2)

Clay County

041

Spencer
21
Jan 15, 1851
Native American lands
Henry Clay, Jr., officer in the Mexican–American War
14

16,667

569 sq mi
(1,474 km2)

Clayton County

043

Elkader
22
Dec 21, 1837
Dubuque County and Wisconsin Territory
John M. Clayton, Delaware Senator
21

18,129

779 sq mi
(2,018 km2)

Clinton County

045

Clinton
23
Dec 21, 1837
Dubuque County and Wisconsin Territory
DeWitt Clinton, New York Governor
66

49,116

695 sq mi
(1,800 km2)

Crawford County

047

Denison
24
Jan 15, 1851
Shelby County
William Harris Crawford, Georgia Senator
44

17,096

714 sq mi
(1,849 km2)

Dallas County

049

Adel
25
Jan 13, 1846
Polk County
George Mifflin Dallas, US Vice President
59

66,135

586 sq mi
(1,518 km2)

Davis County

051

Bloomfield
26
Feb 17, 1843
Van Buren County
Garrett Davis, Kentucky Congressman
97

8,753

503 sq mi
(1,303 km2)

Decatur County

053

Leon
27
Jan 13, 1846
Appanoose County
Stephen Decatur, War of 1812 naval officer
94

8,457

532 sq mi
(1,378 km2)

Delaware County

055

Manchester
28
Dec 21, 1837
Dubuque County and Wisconsin Territory
State of Delaware, home of Iowa statehood advocate US Senator John M. Clayton
41

17,764

578 sq mi
(1,497 km2)

Des Moines County

057

Burlington
29
Sep 6, 1834
Michigan Territory and Wisconsin Territory
Des Moines River that once ran through the county
89

40,325

416 sq mi
(1,077 km2)

Dickinson County

059

Spirit Lake
30
Jan 15, 1851
Kossuth County
Daniel Stevens Dickinson, New York Senator
3

16,667

381 sq mi
(987 km2)

Dubuque County

061

Dubuque
31
Sep 6, 1834
Michigan Territory and Wisconsin Territory
Julien Dubuque, first permanent white settler in Iowa
42

93,653

608 sq mi
(1,575 km2)

Emmet County

063

Estherville
32
Jan 15, 1851
Dickinson County and Kossuth County
Robert Emmet, Irish revolutionary and American republican sympathizer
4

10,302

396 sq mi
(1,026 km2)

Fayette County

065

West Union
33
Dec 21, 1837
Clayton County and Wisconsin Territory
Marquis de Lafayette, Frenchman who aided colonial forces during American Revolutionary War
20

20,880

731 sq mi
(1,893 km2)

Floyd County

067

Charles City
34
Jan 15, 1851
Chickasaw County
Charles Floyd, member of Lewis and Clark Expedition who died in Iowa
18

16,303

501 sq mi
(1,298 km2)

Franklin County

069

Hampton
35
Jan 15, 1851
Chickasaw County
Benjamin Franklin, statesman and US founding father
28

10,680

582 sq mi
(1,507 km2)

Fremont County

071

Sidney
36
Feb 24, 1847
Pottawattamie County
John Charles Fremont, Mexican–American War officer
90

7,441

511 sq mi
(1,323 km2)

Greene County

073

Jefferson
37
Jan 15, 1851
Dallas County
Nathanael Greene, American Revolutionary War general
46

9,336

568 sq mi
(1,471 km2)

Grundy County

075

Grundy Center
38
Jan 15, 1851
Black Hawk County
Felix Grundy, Tennessee Congressman
38

12,453

503 sq mi
(1,303 km2)

Guthrie County

077

Guthrie Center
39
Jul 8, 1851
Jackson County
Edwin B. Guthrie, Mexican–American War officer
58

10,954

591 sq mi
(1,531 km2)

Hamilton County

079

Webster City
40
Dec 22, 1856
Webster County
William W. Hamilton, President of Iowa Senate (1856–1857)
36

15,673

577 sq mi
(1,494 km2)

Hancock County

081

Garner
41
Jan 15, 1851
Wright County
John Hancock, President of First Continental Congress
16

11,341

571 sq mi
(1,479 km2)

Hardin County

083

Eldora
42
Jan 15, 1851
Black Hawk County
John J. Hardin, prominent soldier, Black Hawk War
37

17,534

569 sq mi
(1,474 km2)

Harrison County

085

Logan
43
Jan 15, 1851
Pottawattamie County
William Henry Harrison, US President
55

14,928

697 sq mi
(1,805 km2)

Henry County

087

Mount Pleasant
44
Dec 7, 1836
Wisconsin Territory
Disputed, see reference[14]
88

20,145

434 sq mi
(1,124 km2)

Howard County

089

Cresco
45
Jan 15, 1851
Chickasaw County
Tilghman Howard, US Representative from Indiana
9

9,566

473 sq mi
(1,225 km2)

Humboldt County

091

Dakota City
46
Feb 26, 1857
Webster County
Alexander von Humboldt, German scientist
26

9,815

434 sq mi
(1,124 km2)

Ida County

093

Ida Grove
47
Jan 15, 1851
Cherokee County
Mount Ida in Greece
32

7,089

432 sq mi
(1,119 km2)

Iowa County

095

Marengo
48
Feb 17, 1843
Washington County
Iowa River that flows through the county
63

16,355

586 sq mi
(1,518 km2)

Jackson County

097

Maquoketa
49
Dec 21, 1837
Wisconsin Territory
Andrew Jackson, US President
54

19,848

636 sq mi
(1,647 km2)

Jasper County

099

Newton
50
Jan 13, 1846
Mahaska County
William Jasper, American Revolutionary War sergeant
61

36,842

730 sq mi
(1,891 km2)

Jefferson County

101

Fairfield
51
Jan 21, 1839
Native American lands
Thomas Jefferson, US President
87

16,843

435 sq mi
(1,127 km2)

Johnson County

103

Iowa City
52
Dec 21, 1837
Des Moines County, Iowa and Wisconsin Territory
Richard Mentor Johnson, US Vice President
64

130,882

614 sq mi
(1,590 km2)

Jones County

105

Anamosa
53
Dec 21, 1837
Wisconsin Territory
George Wallace Jones, Iowa Senator
53

20,638

575 sq mi
(1,489 km2)

Keokuk County

107

Sigourney
54
Dec 21, 1837
Washington County
Chief Keokuk
74

10,511

579 sq mi
(1,500 km2)

Kossuth County

109

Algona
55
Jan 15, 1851
Webster County
Lajos Kossuth, Hungarian revolutionary inspired by American democratic ideals
5

15,543

973 sq mi
(2,520 km2)

Lee County

111

Fort Madison and Keokuk
56
Dec 7, 1836
Des Moines County
William Elliott Lee, businessman from the New York Land Company, who sold the county's first tracts of land
99

35,862

517 sq mi
(1,339 km2)

Linn County

113

Cedar Rapids
57
Dec 21, 1837
Wisconsin Territory
Lewis Fields Linn, doctor and Missouri Senator
52

211,226

718 sq mi
(1,860 km2)

Louisa County

115

Wapello
58
Dec 7, 1836
Des Moines County
Disputed, see reference[15]
76

11,387

402 sq mi
(1,041 km2)

Lucas County

117

Chariton
59
Jan 13, 1846
Monroe County
Robert Lucas, first Governor of Iowa Territory
84

8,898

431 sq mi
(1,116 km2)

Lyon County

119

Rock Rapids
60
Jan 15, 1851
Woodbury County, Iowa
Nathaniel Lyon, first Union general to be killed in the American Civil War, (formerly named Buncombe County)
1

11,581

588 sq mi
(1,523 km2)

Madison County

121

Winterset
61
Jan 13, 1846
Polk County
James Madison, US President
70

15,679

561 sq mi
(1,453 km2)

Mahaska County

123

Oskaloosa
62
Feb 17, 1843
Fox and Sac Indian lands
Chief Mahaska
73

22,381

571 sq mi
(1,479 km2)

Marion County

125

Knoxville
63
Jun 10, 1845
Washington County
Francis Marion, American Revolutionary War general
72

33,309

554 sq mi
(1,435 km2)

Marshall County

127

Marshalltown
64
Jan 13, 1846
Jasper County
John Marshall, Chief Justice of the United States Supreme Court
49

40,648

572 sq mi
(1,481 km2)

Mills County

129

Glenwood
65
Jan 15, 1851
Pottawattamie County
Frederick Mills, major killed during the Battle of Churubusco, Mexican–American War
79

15,059

437 sq mi
(1,132 km2)

Mitchell County

131

Osage
66
Jan 15, 1851
Chickasaw County
John Mitchel, Irish revolutionary who operated out of the US
8

10,776

469 sq mi
(1,215 km2)

Monona County

133

Onawa
67
Jan 15, 1851
Harrison County
Native American word thought to mean "peaceful valley"
43

9,243

693 sq mi
(1,795 km2)

Monroe County

135

Albia
68
Feb 17, 1843
Wapello County
James Monroe, US President
85

7,970

433 sq mi
(1,121 km2)

Montgomery County

137

Red Oak
69
Jan 15, 1851
Polk County
Richard Montgomery, American Revolutionary War general
80

10,740

424 sq mi
(1,098 km2)

Muscatine County

139

Muscatine
70
Dec 7, 1836
Des Moines County
debated, possibly Mascouten People
77

42,745

439 sq mi
(1,137 km2)

O'Brien County

141

Primghar
71
Jan 15, 1851
Cherokee County
William Smith O'Brien, Irish revolutionary inspired by American democratic ideals
13

14,398

573 sq mi
(1,484 km2)

Osceola County

143

Sibley
72
Jan 15, 1851
Woodbury County
Osceola, Seminole leader
2

6,462

399 sq mi
(1,033 km2)

Page County

145

Clarinda
73
Feb 24, 1847
Pottawattamie County
John Page, officer killed in Battle of Palo Alto, Mexican–American War
91

15,932

535 sq mi
(1,386 km2)

Palo Alto County

147

Emmetsburg
74
Jan 15, 1851
Kossuth County
Battle of Palo Alto, Mexican–American War
15

9,421

564 sq mi
(1,461 km2)

Plymouth County

149

Le Mars
75
Jan 15, 1851
Woodbury County
Plymouth, Massachusetts
22

24,986

864 sq mi
(2,238 km2)

Pocahontas County

151

Pocahontas
76
Jan 15, 1851
Greene County and Humboldt County
Pocahontas, famous Native American woman
25

7,310

578 sq mi
(1,497 km2)

Polk County

153

Des Moines
77
January 13, 1846
Native American lands
James K. Polk, US President
60

430,640

570 sq mi
(1,476 km2)

Pottawattamie County

155

Council Bluffs
78
Feb 24, 1847
Native American lands
Potawatomi People
67

93,158

954 sq mi
(2,471 km2)

Poweshiek County

157

Montezuma
79
Feb 17, 1843
Meskwaki lands
Chief Poweshiek, Meskwaki
62

18,914

585 sq mi
(1,515 km2)

Ringgold County

159

Mount Ayr
80
Feb 24, 1847
Taylor County
Samuel Ringgold, major killed in the Mexican–American War
93

5,131

538 sq mi
(1,393 km2)

Sac County

161

Sac City
81
Jan 15, 1851
Greene County
Sauk (Sac) People
33

10,350

576 sq mi
(1,492 km2)

Scott County

163

Davenport
82
Dec 21, 1837
Wisconsin Territory
Winfield Scott, War of 1812 General
78

165,224

458 sq mi
(1,186 km2)

Shelby County

165

Harlan
83
Jan 15, 1851
Cass County
Isaac Shelby, American Revolutionary War General, War of 1812
56

12,167

591 sq mi
(1,531 km2)

Sioux County

167

Orange City
84
Jan 15, 1851
Plymouth County
Sioux People
12

33,704

768 sq mi
(1,989 km2)

Story County

169

Nevada
85
Jan 13, 1846
Boone County, Jasper County, and Polk County
Joseph Story, US Supreme Court Justice
48

89,542

573 sq mi
(1,484 km2)

Tama County

171

Toledo
86
Feb 17, 1843
Benton County and Boone County
Disputed, see reference[16]
50

17,767

721 sq mi
(1,867 km2)

Taylor County

173

Bedford
87
February 24, 1847
Page County
Zachary Taylor, US President
92

6,317

534 sq mi
(1,383 km2)

Union County

175

Creston
88
Jan 15, 1851
Clarke County
The union of the states
82

12,534

424 sq mi
(1,098 km2)

Van Buren County

177

Keosauqua
89
Dec 7, 1836
Des Moines County
Martin Van Buren, US President
98

7,570

485 sq mi
(1,256 km2)

Wapello County

179

Ottumwa
90
Feb 17, 1843
Native American lands
Chief Wapello
86

35,625

432 sq mi
(1,119 km2)

Warren County

181

Indianola
91
Jan 13, 1846
Polk County
Joseph Warren, American Revolutionary War General
71

46,225

572 sq mi
(1,481 km2)

Washington County

183

Washington
92
Jan 25, 1839
Wisconsin Territory
George Washington, US President
75

21,704

569 sq mi
(1,474 km2)

Wayne County

185

Corydon
93
Jan 13, 1846
Appanoose County
Anthony Wayne, American Revolutionary War General
95

6,403

526 sq mi
(1,362 km2)

Webster County

187

Fort Dodge
94
Jan 12, 1853
Risley County and Yell County (defunct IA counties)[17]
Daniel Webster, Massachusetts Senator
35

38,013

715 sq mi
(1,852 km2)

Winnebago County

189

Forest City
95
Jan 15, 1851
Kossuth County
Winnebago (Ho–Chunk) People
6

10,866

400 sq mi
(1,036 km2)

Winneshiek County

191

Decorah
96
Feb 20, 1847
Native American lands
Chief Winneshiek
10

21,056

690 sq mi
(1,787 km2)

Woodbury County

193

Sioux City
97
Jan 12, 1853
Wahkaw County (renamed), Polk County
Levi Woodbury, New Hampshire Governor
31

102,172

873 sq mi
(2,261 km2)

Worth County

195

Northwood
98
Jan 15, 1851
Mitchell County
William Jenkins Worth, Black Hawk War and Mexican–American War officer
7

7,598

400 sq mi
(1,036 km2)

Wright County

197

Clarion
99
Jan 15, 1851
Webster County and Kossuth County
Silas Wright, New York Governor, and Joseph Albert Wright, Indiana Governor (brothers)
27

13,229

581 sq mi
(1,505 km2)

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