Iowa

Iowa has 99 Counties.

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    • Iowa State Association of Counties
    5500 Westown Parkway, Suite 190
    West Des Moines, IA 50266
    Phone: (515)244-7181
    Fax: (515)244-6397
    http://www.iowacounties.org/

    County NACo
    Member    		 2010
    Population    		 Square
    Miles    		 County Seat Board
    Size    		 Founded
    Adair   7,682 569 Greenfield   5  1851 
    Adams   4,029 423 Corning   5  1851 
    Allamakee 14,330 639 Waukon   3  1847 
    Appanoose 12,887 497 Centerville   3  1843 
    Audubon   6,119 443 Audubon   3  1851 
    Benton 26,076 716 Vinton   3  1837 
    Black Hawk 131,090 566 Waterloo   5  1843 
    Boone 26,306 572 Boone   3  1846 
    Bremer 24,276 435 Waverly   3  1851 
    Buchanan 20,958 571 Independence   3  1837 
    Buena Vista 20,260 575 Storm Lake   5  1851 
    Butler 14,867 580 Allison   3  1851 
    Calhoun 9,670 570 Rockwell City   3  1851 
    Carroll 20,816 569 Carroll   5  1851 
    Cass 13,956 564 Atlantic   5  1851 
    Cedar   18,499 579 Tipton   5  1837 
    Cerro Gordo 44,151 568 Mason City   3  1851 
    Cherokee 12,072 577 Cherokee   5  1851 
    Chickasaw 12,439 504 New Hampton   5  1851 
    Clarke 9,286 431 Osceola   3  1846 
    Clay 16,667 567 Spencer   5  1851 
    Clayton 18,129 779 Elkader   3  1837 
    Clinton 49,116 695 Clinton   3  1837 
    Crawford 17,096 714 Denison   5  1851 
    Dallas 66,135 588 Adel   3  1846 
    Davis   8,753 502 Bloomfield   3  1843 
    Decatur   8,457 532 Leon   3  1846 
    Delaware   17,764 578 Manchester  3  1837 
    Des Moines 40,325 416 Burlington  3  1834 
    Dickinson 16,667 381 Spirit Lake   5  1851 
    Dubuque 93,653 608 Dubuque   3  1834 
    Emmet 10,302 396 Estherville   5  1851 
    Fayette   20,880 731 West Union   3  1837 
    Floyd   16,303 501 Charles City   3  1851 
    Franklin 10,680 582 Hampton   3  1851 
    Fremont 7,441 511 Sidney   3  1847 
    Greene 9,336 570 Jefferson   5  1851 
    Grundy 12,453 502 Grundy Center   5  1851 
    Guthrie   10,954 591 Guthrie Center   5  1851 
    Hamilton 15,673 577 Webster City   3  1856 
    Hancock   11,341 571 Garner   3  1851 
    Hardin 17,534 569 Eldora   3  1851 
    Harrison   14,928 697 Logan   3  1851 
    Henry 20,145 434 Mount Pleasant   3  1836 
    Howard 9,566 473 Cresco   3  1851 
    Humboldt 9,815 434 Dakota City   5  1851 
    Ida   7,089 432 Ida Grove   3  1851 
    Iowa   16,355 586 Marengo   5  1843 
    Jackson 19,848 636 Maquoketa   3  1837 
    Jasper 36,842 730 Newton   3  1846 
    Jefferson 16,843 436 Fairfield   3  1839 
    Johnson 130,882 614 Iowa City   5  1837 
    Jones 20,638 576 Anamosa   5  1837 
    Keokuk   10,511 579 Sigourney   3  1837 
    Kossuth 15,543 973 Algona   5  1851 
    Lee   35,862 518 Fort Madison and Keokuk   5  1836 
    Linn 211,226 717 Cedar Rapids   5  1837 
    Louisa 11,387 402 Wapello   3  1836 
    Lucas 8,898 431 Chariton   3  1846 
    Lyon 11,581 588 Rock Rapids   5  1851 
    Madison   15,679 561 Winterset   3  1844 
    Mahaska   22,381 571 Oskaloosa   3  1843 
    Marion 33,309 555 Knoxville   3  1845 
    Marshall 40,648 573 Marshalltown   3  1846 
    Mills 15,059 437 Glenwood   3  1851 
    Mitchell 10,776 469 Osage   3  1851 
    Monona 9,243 694 Onawa   3  1851 
    Monroe   7,970 434 Albia   3  1843 
    Montgomery   10,740 424 Red Oak   5  1851 
    Muscatine   42,745 437 Muscatine   5  1836 
    O'Brien   14,398 573 Primghar   5  1851 
    Osceola   6,462 399 Sibley   5  1851 
    Page   15,932 535 Clarinda   3  1847 
    Palo Alto 9,421 564 Emmetsburg   5  1851 
    Plymouth 24,986 863 Le Mars   5  1851 
    Pocahontas 7,310 577 Pocahontas   5  1851 
    Polk 430,640 574 Des Moines   5  1846 
    Pottawattamie 93,158 950 Council Bluffs   5  1848 
    Poweshiek 18,914 585 Montezuma   3  1843 
    Ringgold   5,131 536 Mount Ayr   3  1855 
    Sac 10,350 575 Sac City   3  1851 
    Scott 165,224 458 Davenport   5  1837 
    Shelby 12,167 591 Harlan   3  1851 
    Sioux 33,704 768 Orange City   5  1851 
    Story 89,542 573 Nevada   3  1846 
    Tama 17,767 721 Toledo   3  1843 
    Taylor 6,317 532 Bedford   3  1847 
    Union 12,534 424 Creston   5  1851 
    Van Buren   7,570 485 Keosauqua   3  1836 
    Wapello 35,625 432 Ottumwa   3  1843 
    Warren 46,225 570 Indianola   3  1846 
    Washington 21,704 569 Washington  5  1837 
    Wayne 6,403 525 Corydon   3  1846 
    Webster 38,013 716 Fort Dodge   5  1853 
    Winnebago 10,866 400 Forest City   3  1847 
    Winneshiek 21,056 690 Decorah   5  1847 
    Woodbury 102,172 873 Sioux City  5  1851 
    Worth 7,598 400 Northwood   3  1851 
    Wright 13,229 580 Clarion   3  1851