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Iowa Counties
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Iowa Counties

There are ninety-nine counties in 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]. Two years later, the western portion was split off to become Iowa Territory. The south-eastern part of Iowa Territory became Iowa, the 29th state in the union, on 28 December 1846, 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.

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Carroll County, Iowa

Carroll County Education, Geography, and HistoryCarroll County, Iowa Courthouse

Carroll County is a county located in the state of Iowa. Based on the 2010 census, the population was 20,816. Carroll County was created on January 15, 1851. The county seat is Carroll. The county is named in honor of Charles Carroll of Carrollton, signer of the Declaration of Independence.

Etymology - Origin of Carroll County Name

Carroll County is named in honor of Charles Carroll of Carrollton, Maryland. He was the only Roman Catholic to sign the Declaration of Independence, and the longest living signer.


County QuickFacts: Census Bureau Quick Facts

Carroll County History

The county was established in 1851. In 1855 a county government was set up in the town Carrollton. Three years later a courthouse was constructed at a cost of approximately $3,000. Construction was begun by Nelson Moore, but he died with only one floor completed. The second story was completed by L. J. Hampton.

In 1869 the centrally located railroad town of Carroll City was selected as the county seat, replacing, with some protest, Carrollton. The Chicago and Northwestern Railroad laid out the town and built its first building, a warehouse. Later a $4,000 courthouse was constructed on the town square. This building was used until it burned to the ground in 1886. The vaults and records were undamaged, however, and moved to temporary housing in the Joyce Building and Drees' Music Hall.

The following winter a $40,000 bond issue was approved toward the construction of a new, permanent courthouse. The impressive building was built on the northwest corner of the square (the parking lot of the current courthouse). The stone and brick building, complete with a clock tower, was used for more than three-quarters of a century. It was replaced by a modern-looking building in 1965.

A $750,000 bond issue was used to construct and equip the new courthouse. This building was officially dedicated on September 24, 1966. The highlight of the dedication ceremony was the opening of the boxes sealed in the cornerstone of the old courthouse. The bell from the previous courthouse clock tower sits on the courthouse grounds.

Source: Marie Hackett, Secretary, Carroll County Historical Society, 1991

Geography: Land and Water

As reported by the Census Bureau, the county has a total area of 570 square miles (1,500 km2), of which 569 square miles (1,470 km2) is land and 0.8 square miles (2.1 km2) (0.1%) is water.

Carroll county is located in west Iowa.

Neighboring Counties

Bordering counties are as follows:

  • Northeast: Calhoun County
  • East: Greene County
  • Southeast: Guthrie County
  • South: Audubon County
  • Southwest: Shelby County
  • West: Crawford County
  • Northwest: Sac County


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