Plymouth County (Iowa)

The Plymouth County is a county located in the U.S. state of Iowa. In the census in 2010, the County had 24,986 inhabitants and a population density of 1.0 inhabitants per square kilometer. The administrative headquarters ( County Seat) is Le Mars.


The County is located in northwestern Iowa. The western boundary of the Plymouth County is formed from the Big Sioux River and is also the border with South Dakota.

A few miles below the southern boundary of the Plymouth County culminate in Sioux City that belongs just to the north of Plymouth County, the Big Sioux River and the Floyd River in the Missouri River.

The county has an area of ​​2,238 square kilometers, of which a square kilometers of water surface. It borders the following Nachbarcountys:


The Plymouth County was formed on 15 January 1851. The settlement began in 1856. In October 1859 the first courthouse was built and the first public school opened its doors with 32 students. 1872, the seat of county government was moved to Le Mars and in 1873 built a new courthouse and a prison there. The courthouse still in use was built in 1900 of red sandstone.

During the Great Depression of 1929, the farmers organized into a group, called the Farmers Holiday Group. Their goal was achieved farm products to sell directly in the surrounding towns, to the exclusion of trade. A radical group among them Judge Bradley abducted from his courtroom and threatened to hang him outside the courthouse. Although Bradley was rescued, but the governor ordered the National Guard to Plymouth County and imposed a state of emergency, which meant the end of the Farmers Holiday Group.

Demographic data

According to the census in 2010 living in Plymouth County 24,986 people in 9,804 households. The population density was 1.0 people per square kilometer.

The racial the population was composed of 96.4 percent white, 0.3 percent African American, 0.3 percent Native American, 0.5 percent Asian and other ethnic groups; 1.0 percent were descended from two or more races. Regardless of ethnicity were 3.0 percent of the population are Hispanic or Latino of any race.

In the 9,804 households lived statistically 2.53 per person.

26.0 percent of the population were under 18 years old, 57.4 percent were between 18 and 64 and 16.6 percent were 65 years or older. 50.5 percent of the population was female.

The median income for a household was $ 56,379. The per capita income was $ 28,060. 4.8 percent of the population lived below the poverty line.

Places in Plymouth County


  • Akron
  • Brunsville
  • Craig
  • Hinton
  • Kingsley
  • Le Mars
  • Merrill
  • Oyens
  • Remsen
  • Sioux City1
  • Struble
  • Westfield

Unincorporated communities

  • Adaville
  • Lemars
  • Millnerville
  • Neptune
  • Ruble
  • Seney
  • Union Center
  • West Le Mars

1 - predominantly in Woodbury County


The Plymouth County is divided into 24 townships:

  • America Township
  • Elgin Township
  • Elkhorn Township
  • Fredonia Township
  • Garfield Township
  • Grant Township
  • Hancock Township
  • Henry Township
  • Hungerford Township
  • Johnson Township
  • Liberty Township
  • Lincoln Township
  • Marion Township
  • Meadow Township
  • Perry Township
  • Plymouth Township
  • Portland Township
  • Preston Township
  • Remsen Township
  • Sioux Township
  • Stanton Township
  • Union Township
  • Washington Township
  • Westfield Township

The city of Sioux City belongs to no Township.