County
|
FIPS Code[1] |
County Seat
[2] |
Established
[3] |
Formed from
[4] |
Etymology
[5][3] |
Population
(2000) [2] |
Area
[2] |
Map
|
| Adair County |
001 |
Greenfield |
01851-01-15 15 January 1851 |
Cass County |
John Adair (1757-1840), sixth governor of Kentucky |
&&&&&&&&&&&08243.&&&&&08,243 |
569 mi²
(916 km²) |
 |
| Adams County |
003 |
Corning |
01851-01-15 15 January 1851 |
Taylor County |
John Adams, second president of the United States (1797-1801) |
&&&&&&&&&&&04482.&&&&&04,482 |
424 mi²
(682 km²) |
 |
| Allamakee County |
005 |
Waukon |
01847-02-20 20 February 1847 |
Clayton County |
Allen Magee (or Allan Makee), an early Indian trader |
&&&&&&&&&&014675.&&&&&014,675 |
640 mi²
(1,030 km²) |
 |
| Appanoose County |
007 |
Centerville |
01843-02-17 17 February 1843 |
Davis County |
Appanoose, Native American who headed peace party in the Black Hawk War |
&&&&&&&&&&013721.&&&&&013,721 |
496 mi²
(798 km²) |
 |
| Audubon County |
009 |
Audubon |
01851-01-15 15 January 1851 |
Black Hawk County and Cass County |
John James Audubon (1785-1851), ornithologist and artist |
&&&&&&&&&&&06830.&&&&&06,830 |
443 mi²
(713 km²) |
 |
| Benton County |
011 |
Vinton |
01837-12-21 21 December 1837 |
Native American lands and Wisconsin Territory |
Thomas Hart Benton, U.S. senator |
&&&&&&&&&&025308.&&&&&025,308 |
716 mi²
(1,152 km²) |
 |
| Black Hawk County |
013 |
Waterloo |
01843-02-17 17 February 1843 |
Delaware County |
Black Hawk, chief of Fox and Sac Indians and leader in the Black Hawk War |
&&&&&&&&&0128012.&&&&&0128,012 |
567 mi²
(912 km²) |
 |
| Boone County |
015 |
Boone |
01846-01-13 13 January 1846 |
Polk County |
Nathan Boone (1782-1863), one of the first to survey Iowa |
&&&&&&&&&&026224.&&&&&026,224 |
572 mi²
(921 km²) |
 |
| Bremer County |
017 |
Waverly |
01851-01-15 15 January 1851 |
Native American lands and Winnebago County |
Frederika Bremer (1801-1865), Swedish poet and author |
&&&&&&&&&&023325.&&&&&023,325 |
428 mi²
(689 km²) |
 |
| Buchanan County |
019 |
Independence |
01837-12-21 21 December 1837 |
Delaware County and Wisconsin Territory |
James Buchanan, fifteenth president (1857-1861) |
&&&&&&&&&&021093.&&&&&021,093 |
571 mi²
(919 km²) |
 |
| Buena Vista County |
021 |
Storm Lake |
01851-01-15 15 January 1851 |
Clay County and Sac County |
Buena Vista, a battle during the Mexican-American War |
&&&&&&&&&&020411.&&&&&020,411 |
575 mi²
(925 km²) |
 |
| Butler County |
023 |
Allison |
01851-01-15 15 January 1851 |
Black Hawk County and Buchanan County |
William Orlando Butler (1791-1880), unsuccessful candidate for Vice President |
&&&&&&&&&&015305.&&&&&015,305 |
580 mi²
(933 km²) |
 |
| Calhoun County |
025 |
Rockwell City |
01851-01-15 15 January 1851 |
? |
John Caldwell Calhoun, Vice President (1825-1832) |
&&&&&&&&&&011115.&&&&&011,115 |
570 mi²
(917 km²) |
 |
| Carroll County |
027 |
Carroll |
01851-01-15 15 January 1851 |
Guthrie County |
Charles Carroll (1737-1832), longest lived signer of the Declaration of Independence |
&&&&&&&&&&021421.&&&&&021,421 |
569 mi²
(916 km²) |
 |
| Cass County |
029 |
Atlantic |
01851-01-15 15 January 1851 |
Pottawattamie County |
Lewis Cass, Senator from Michigan and unsuccessful candidate for president (1848) |
&&&&&&&&&&014684.&&&&&014,684 |
564 mi²
(908 km²) |
 |
| Cedar County |
031 |
Tipton |
01837-12-21 21 December 1837 |
Wisconsin Territory |
Red Cedar River, river that runs through county |
&&&&&&&&&&018187.&&&&&018,187 |
580 mi²
(933 km²) |
 |
| Cerro Gordo County |
033 |
Mason City |
01851-01-15 15 January 1851 |
Floyd County |
Cerro Gordo, site of battle during the Mexican-American War |
&&&&&&&&&&046447.&&&&&046,447 |
568 mi²
(914 km²) |
 |
| Cherokee County |
035 |
Cherokee |
01851-01-15 15 January 1851 |
Crawford County |
Cherokee Native American tribe |
&&&&&&&&&&013035.&&&&&013,035 |
577 mi²
(929 km²) |
 |
| Chickasaw County |
037 |
New Hampton |
01851-01-15 15 January 1851 |
Fayette County |
Chickasaw Native American tribe |
&&&&&&&&&&013095.&&&&&013,095 |
505 mi²
(813 km²) |
 |
| Clarke County |
039 |
Osceola |
01846-01-13 13 January 1846 |
Lucas County |
James Clarke, third governor of Iowa Territory (1845-1846) |
&&&&&&&&&&&09133.&&&&&09,133 |
431 mi²
(694 km²) |
 |
| Clay County |
041 |
Spencer |
01851-01-15 15 January 1851 |
Native American lands |
Lieutenant Colonel Henry Clay, Jr. (1807-1847), hero of the Mexican-American War |
&&&&&&&&&&017372.&&&&&017,372 |
569 mi²
(916 km²) |
 |
| Clayton County |
043 |
Elkader |
01837-12-21 21 December 1837 |
Dubuque County and Wisconsin Territory |
John M. Clayton (1796-1856), U.S. senator from Delaware |
&&&&&&&&&&018678.&&&&&018,678 |
779 mi²
(1,254 km²) |
 |
| Clinton County |
045 |
Clinton |
01837-12-21 21 December 1837 |
Dubuque County and Wisconsin Territory |
DeWitt Clinton (1769-1828), governor of New York |
&&&&&&&&&&050149.&&&&&050,149 |
695 mi²
(1,118 km²) |
 |
| Crawford County |
047 |
Denison |
01851-01-15 15 January 1851 |
Shelby County |
? |
&&&&&&&&&&016942.&&&&&016,942 |
714 mi²
(1,149 km²) |
 |
| Dallas County |
049 |
Adel |
01846-01-13 13 January 1846 |
Polk County |
? |
&&&&&&&&&&040750.&&&&&040,750 |
586 mi²
(943 km²) |
 |
| Davis County |
051 |
Bloomfield |
01843-02-17 17 February 1843 |
Van Buren County |
? |
&&&&&&&&&&&08541.&&&&&08,541 |
503 mi²
(810 km²) |
 |
| Decatur County |
053 |
Leon |
01846-01-13 13 January 1846 |
Appanoose County |
? |
&&&&&&&&&&&08689.&&&&&08,689 |
532 mi²
(856 km²) |
 |
| Delaware County |
055 |
Manchester |
01837-12-21 21 December 1837 |
Dubuque County and Wisconsin Territory |
? |
&&&&&&&&&&018404.&&&&&018,404 |
578 mi²
(930 km²) |
 |
| Des Moines County |
057 |
Burlington |
01834-09-06 6 September 1834 |
Michigan Territory and Wisconsin Territory |
? |
&&&&&&&&&&042351.&&&&&042,351 |
416 mi²
(669 km²) |
 |
| Dickinson County |
059 |
Spirit Lake |
01851-01-15 15 January 1851 |
Kossuth County |
? |
&&&&&&&&&&016424.&&&&&016,424 |
381 mi²
(631 km²) |
 |
| Dubuque County |
061 |
Dubuque |
01834-09-06 6 September 1834 |
Michigan Territory and Wisconsin Territory |
? |
&&&&&&&&&&089143.&&&&&089,143 |
608 mi²
(978 km²) |
 |
| Emmet County |
063 |
Estherville |
01851-01-15 15 January 1851 |
Dickinson County and Kossuth County |
? |
&&&&&&&&&&011027.&&&&&011,027 |
396 mi²
(637 km²) |
 |
| Fayette County |
065 |
West Union |
01837-12-21 21 December 1837 |
Clayton County and Wisconsin Territory |
? |
&&&&&&&&&&022008.&&&&&022,008 |
731 mi²
(1,176 km²) |
 |
| Floyd County |
067 |
Charles City |
01851-01-15 15 January 1851 |
Chickasaw County |
? |
&&&&&&&&&&016900.&&&&&016,900 |
501 mi²
(806 km²) |
 |
| Franklin County |
069 |
Hampton |
01851-01-15 15 January 1851 |
Chickasaw County |
? |
&&&&&&&&&&010704.&&&&&010,704 |
582 mi²
(937 km²) |
 |
| Fremont County |
071 |
Sidney |
01847-02-24 24 February 1847 |
Pottawattamie County |
? |
&&&&&&&&&&&08010.&&&&&08,010 |
511 mi²
(822 km²) |
 |
| Greene County |
073 |
Jefferson |
01851-01-15 15 January 1851 |
Dallas County |
? |
&&&&&&&&&&010366.&&&&&010,366 |
568 mi²
(914 km²) |
 |
| Grundy County |
075 |
Grundy Center |
01851-01-15 15 January 1851 |
Black Hawk County |
? |
&&&&&&&&&&012369.&&&&&012,369 |
503 mi²
(810 km²) |
 |
| Guthrie County |
077 |
Guthrie Center |
01851-07-08 8 July 1851 |
Jackson County |
? |
&&&&&&&&&&011353.&&&&&011,353 |
591 mi²
(951 km²) |
 |
| Hamilton County |
079 |
Webster City |
01856-12-22 22 December 1856 |
Webster County |
? |
&&&&&&&&&&016438.&&&&&016,438 |
577 mi²
(929 km²) |
 |
| Hancock County |
081 |
Garner |
01851-01-15 15 January 1851 |
Wright County |
? |
&&&&&&&&&&012100.&&&&&012,100 |
571 mi²
(919 km²) |
 |
| Hardin County |
083 |
Eldora |
01851-01-15 15 January 1851 |
Black Hawk County |
? |
&&&&&&&&&&018812.&&&&&018,812 |
569 mi²
(916 km²) |
 |
| Harrison County |
085 |
Logan |
01851-01-15 15 January 1851 |
Pottawattamie County |
? |
&&&&&&&&&&015666.&&&&&015,666 |
697 mi²
(1,122 km²) |
 |
| Henry County |
087 |
Mount Pleasant |
01836-12-07 7 December 1836 |
Wisconsin Territory |
? |
&&&&&&&&&&020336.&&&&&020,336 |
434 mi²
(698 km²) |
 |
| Howard County |
089 |
Cresco |
01851-01-15 15 January 1851 |
Chickasaw County |
? |
&&&&&&&&&&&09932.&&&&&09,932 |
473 mi²
(761 km²) |
 |
| Humboldt County |
091 |
Dakota City |
01857-02-26 26 February 1857 |
Webster County |
? |
&&&&&&&&&&010381.&&&&&010,381 |
434 mi²
(698 km²) |
 |
| Ida County |
093 |
Ida Grove |
01851-01-15 15 January 1851 |
Cherokee County |
? |
&&&&&&&&&&&07837.&&&&&07,837 |
432 mi²
(695 km²) |
 |
| Iowa County |
095 |
Marengo |
01843-02-17 17 February 1843 |
Washington County |
? |
&&&&&&&&&&015671.&&&&&015,671 |
586 mi²
(943 km²) |
 |
| Jackson County |
097 |
Maquoketa |
01837-12-21 21 December 1837 |
Wisconsin Territory |
? |
&&&&&&&&&&020296.&&&&&020,296 |
636 mi²
(1,024 km²) |
 |
| Jasper County |
099 |
Newton |
01846-01-13 13 January 1846 |
Mahaska County |
? |
&&&&&&&&&&037213.&&&&&037,213 |
730 mi²
(1,175 km²) |
 |
| Jefferson County |
101 |
Fairfield |
01839-01-21 21 January 1839 |
Native American lands |
? |
&&&&&&&&&&016181.&&&&&016,181 |
435 mi²
(700 km²) |
 |
| Johnson County |
103 |
Iowa City |
01837-12-21 21 December 1837 |
Des Moines County, Iowa and Wisconsin Territory |
? |
&&&&&&&&&0111006.&&&&&0111,006 |
614 mi²
(988 km²) |
 |
| Jones County |
105 |
Anamosa |
01837-12-21 21 December 1837 |
Wisconsin Territory |
? |
&&&&&&&&&&020221.&&&&&020,221 |
575 mi²
(925 km²) |
 |
| Keokuk County |
107 |
Sigourney |
01837-12-21 21 December 1837 |
Washington County |
? |
&&&&&&&&&&011400.&&&&&011,400 |
579 mi²
(932 km²) |
 |
| Kossuth County |
109 |
Algona |
01851-01-15 15 January 1851 |
Webster County |
? |
&&&&&&&&&&017163.&&&&&017,163 |
973 mi²
(1,566 km²) |
 |
| Lee County |
111 |
Fort Madison |
01836-12-07 7 December 1836 |
Des Moines County |
? |
&&&&&&&&&&038052.&&&&&038,052 |
517 mi²
(832 km²) |
 |
| Linn County |
113 |
Cedar Rapids |
01837-12-21 21 December 1837 |
Wisconsin Territory |
? |
&&&&&&&&&0191701.&&&&&0191,701 |
718 mi²
(1,156 km²) |
 |
| Louisa County |
115 |
Wapello |
01836-12-07 7 December 1836 |
Des Moines County |
? |
&&&&&&&&&&012183.&&&&&012,183 |
402 mi²
(647 km²) |
 |
| Lucas County |
117 |
Chariton |
01846-01-13 13 January 1846 |
Monroe County |
? |
&&&&&&&&&&&09422.&&&&&09,422 |
431 mi²
(694 km²) |
 |
| Lyon County |
119 |
Rock Rapids |
01851-01-15 15 January 1851 |
Woodbury County, Iowa |
? |
&&&&&&&&&&011763.&&&&&011,763 |
588 mi²
(946 km²) |
 |
| Madison County |
121 |
Winterset |
01846-01-13 13 January 1846 |
Polk County |
? |
&&&&&&&&&&014019.&&&&&014,019 |
561 mi²
(903 km²) |
 |
| Mahaska County |
123 |
Oskaloosa |
01843-02-17 17 February 1843 |
Fox and Sac Indian lands |
? |
&&&&&&&&&&022335.&&&&&022,335 |
571 mi²
(919 km²) |
 |
| Marion County |
125 |
Knoxville |
01845-06-10 10 June 1845 |
Washington County |
? |
&&&&&&&&&&032052.&&&&&032,052 |
554 mi²
(892 km²) |
 |
| Marshall County |
127 |
Marshalltown |
01846-01-13 13 January 1846 |
Jasper County |
? |
&&&&&&&&&&039311.&&&&&039,311 |
572 mi²
(921 km²) |
 |
| Mills County |
129 |
Glenwood |
01851-01-15 15 January 1851 |
Pottawattamie County |
? |
&&&&&&&&&&014547.&&&&&014,547 |
437 mi²
(703 km²) |
 |
| Mitchell County |
131 |
Osage |
01851-01-15 15 January 1851 |
Chickasaw County |
? |
&&&&&&&&&&010874.&&&&&010,874 |
469 mi²
(755 km²) |
 |
| Monona County |
133 |
Onawa |
01851-01-15 15 January 1851 |
Harrison County |
? |
&&&&&&&&&&010020.&&&&&010,020 |
693 mi²
(1,115 km²) |
 |
| Monroe County |
135 |
Albia |
01843-02-17 17 February 1843 |
? |
? |
&&&&&&&&&&&08016.&&&&&08,016 |
433 mi²
(697 km²) |
 |
| Montgomery County |
137 |
Red Oak |
01851-01-15 15 January 1851 |
Polk County |
? |
&&&&&&&&&&011771.&&&&&011,771 |
424 mi²
(682 km²) |
 |
| Muscatine County |
139 |
Muscatine |
01836-12-07 7 December 1836 |
Des Moines County |
? |
&&&&&&&&&&041722.&&&&&041,722 |
439 mi²
(707 km²) |
 |
| O'Brien County |
141 |
Primghar |
01851-01-15 15 January 1851 |
Cherokee County |
? |
&&&&&&&&&&015102.&&&&&015,102 |
573 mi²
(922 km²) |
 |
| Osceola County |
143 |
Sibley |
01851-01-15 15 January 1851 |
Woodbury County |
? |
&&&&&&&&&&&07003.&&&&&07,003 |
399 mi²
(642 km²) |
 |
| Page County |
145 |
Clarinda |
01847-02-24 24 February 1847 |
Pottawattamie County |
? |
&&&&&&&&&&016976.&&&&&016,976 |
535 mi²
(861 km²) |
 |
| Palo Alto County |
147 |
Emmetsburg |
01851-01-15 15 January 1851 |
Kossuth County |
? |
&&&&&&&&&&010147.&&&&&010,147 |
564 mi²
(908 km²) |
 |
| Plymouth County |
149 |
Le Mars |
01851-01-15 15 January 1851 |
Woodbury County |
? |
&&&&&&&&&&024849.&&&&&024,849 |
864 mi²
(1,390 km²) |
 |
| Pocahontas County |
151 |
Pocahontas |
01851-01-15 15 January 1851 |
Greene County and Humboldt County |
? |
&&&&&&&&&&&08662.&&&&&08,662 |
578 mi²
(930 km²) |
 |
| Polk County |
153 |
Des Moines |
01846-01-13 13 January 1846 |
Native American lands |
? |
&&&&&&&&&0374601.&&&&&0374,601 |
570 mi²
(917 km²) |
 |
| Pottawattamie County |
155 |
Council Bluffs |
01847-02-24 24 February 1847 |
Native American lands |
? |
&&&&&&&&&&087704.&&&&&087,704 |
954 mi²
(1,535 km²) |
 |
| Poweshiek County |
157 |
Montezuma |
01843-02-17 17 February 1843 |
Mesquakie Indian lands |
? |
&&&&&&&&&&018815.&&&&&018,815 |
585 mi²
(941 km²) |
 |
| Ringgold County |
159 |
Mount Ayr |
01847-02-24 24 February 1847 |
Taylor County |
? |
&&&&&&&&&&&05469.&&&&&05,469 |
538 mi²
(866 km²) |
 |
| Sac County |
161 |
Sac City |
01851-01-15 15 January 1851 |
Greene County |
? |
&&&&&&&&&&011529.&&&&&011,529 |
576 mi²
(927 km²) |
 |
| Scott County |
163 |
Davenport |
01837-12-21 21 December 1837 |
Wisconsin Territory |
General Winfield Scott[6]U.S. Army General during the War of 1812, the Mexican-American War, the Black Hawk War, the Second Seminole War, and, briefly, the American Civil War |
&&&&&&&&&0158668.&&&&&0158,668 |
458 mi²
(737 km²) |
 |
| Shelby County |
165 |
Harlan |
01851-01-15 15 January 1851 |
Cass County |
? |
&&&&&&&&&&013173.&&&&&013,173 |
591 mi²
(951 km²) |
 |
| Sioux County |
167 |
Orange City |
01851-01-15 15 January 1851 |
Plymouth County |
? |
&&&&&&&&&&031589.&&&&&031,589 |
768 mi²
(1,236 km²) |
 |
| Story County |
169 |
Nevada |
01846-01-13 13 January 1846 |
Boone County, Jasper County, and Polk County |
? |
&&&&&&&&&&079981.&&&&&079,981 |
573 mi²
(922 km²) |
 |
| Tama County |
171 |
Toledo |
01843-02-17 17 February 1843 |
Benton County and Boone County |
? |
&&&&&&&&&&018103.&&&&&018,103 |
721 mi²
(1,160 km²) |
 |
| Taylor County |
173 |
Bedford |
01847-02-24 24 February 1847 |
Page County |
? |
&&&&&&&&&&&06958.&&&&&06,958 |
534 mi²
(859 km²) |
 |
| Union County |
175 |
Creston |
01851-01-15 15 January 1851 |
Clarke County |
? |
&&&&&&&&&&012309.&&&&&012,309 |
424 mi²
(682 km²) |
 |
| Van Buren County |
177 |
Keosauqua |
01836-12-07 7 December 1836 |
Des Moines County |
? |
&&&&&&&&&&&07809.&&&&&07,809 |
485 mi²
(781 km²) |
 |
| Wapello County |
179 |
Ottumwa |
01843-02-17 17 February 1843 |
Native American lands |
? |
&&&&&&&&&&036051.&&&&&036,051 |
432 mi²
(695 km²) |
 |
| Warren County |
181 |
Indianola |
01846-01-13 13 January 1846 |
Polk County |
? |
&&&&&&&&&&040671.&&&&&040,671 |
572 mi²
(921 km²) |
 |
| Washington County |
183 |
Washington |
01839-01-25 25 January 1839 |
Wisconsin Territory |
? |
&&&&&&&&&&020670.&&&&&020,670 |
569 mi²
(916 km²) |
 |
| Wayne County |
185 |
Corydon |
01846-01-13 13 January 1846 |
Appanoose County |
? |
&&&&&&&&&&&06730.&&&&&06,730 |
526 mi²
(847 km²) |
 |
| Webster County |
187 |
Fort Dodge |
01853-01-12 12 January 1853 |
? |
? |
&&&&&&&&&&040235.&&&&&040,235 |
715 mi²
(1,151 km²) |
 |
| Winnebago County |
189 |
Forest City |
01851-01-15 15 January 1851 |
Kossuth County |
? |
&&&&&&&&&&011723.&&&&&011,723 |
400 mi²
(644 km²) |
 |
| Winneshiek County |
191 |
Decorah |
01847-02-20 20 February 1847 |
Native American lands |
? |
&&&&&&&&&&021310.&&&&&021,310 |
690 mi²
(1,110 km²) |
 |
| Woodbury County |
193 |
Sioux City |
01853-01-12 12 January 1853 |
? |
? |
&&&&&&&&&0103877.&&&&&0103,877 |
873 mi²
(1,405 km²) |
 |
| Worth County |
195 |
Northwood |
01851-01-15 15 January 1851 |
Mitchell County |
? |
&&&&&&&&&&&07909.&&&&&07,909 |
400 mi²
(644 km²) |
 |
| Wright County |
197 |
Clarion |
01851-01-15 15 January 1851 |
Webster County |
? |
&&&&&&&&&&014334.&&&&&014,334 |
581 mi²
(935 km²) |
 |