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There are 99 counties in the U.S. state of Iowa. The first two counties, Des Moines County and Dubuque County, were created in 1834 when Iowa was still part of the Michigan Territory. In preparation for Michigan's statehood, part of Michigan Territory was formed into Wisconsin Territory in 1836.〔(【引用サイトリンク】 title=The Creation of Wisconsin Territory )〕 Two years later, the western portion was split off to become Iowa Territory. 〔(【引用サイトリンク】 title=Chronology of Wisconsin History )〕 The south-eastern part of Iowa Territory became Iowa, the 29th state in the union, on 28 December 1846,〔(【引用サイトリンク】 title=Statehood Dates )〕 by which point 44 counties had been created. Counties continued to be created by the state government until 1857, when the last county, Humboldt County, was created.〔 One of the most significant days in Iowa county history was January 15, 1851, on which 49 counties were created.〔(【引用サイトリンク】url=http://historical-county.newberry.org/website/Iowa/documents/IA_Consolidated_Chronology.htm )〕 The Iowa Constitution of 1857, which is still in effect today, states that counties must have an area of at least , nor can any county be reduced below that size by boundary changes.〔(【引用サイトリンク】title=Iowa Commentary )〕 However, exceptions to this rule were granted, as ten counties have areas below this size. (The table below shows land area, but the Constitution deals with total area.〔) The smallest county (Dickinson) has a land area of , while the largest (Kossuth) has an area 973 sq mi (2,520 km²). Polk County is the most densely populated county at , an increase in density from 2000 when it was . Polk County contains the state's capital and largest city, Des Moines. In addition Iowa has one of the fewest number of counties whose boundaries are dictated by natural means, the vast majority of which being formed by lines of survey instead, resulting in a large number of "box counties". __NOTOC__ ==County information== The number in the column headed "#" is the one used on the map from the National Atlas of the United States, shown on the left. The Federal Information Processing Standard (FIPS) code, which is used by the United States government to uniquely identify counties, is provided with each entry. The FIPS code for each county links to census data for that county. 〕 Louisa Massey, a woman then famous for avenging the death of her brother; ''or'' Louisa County, Virginia| Area=402|Population=11387|Data3=Des Moines County|size=120}} |} 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「List of counties in Iowa」の詳細全文を読む スポンサード リンク
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