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Plymouth County, Iowa


Plymouth County, Iowa

Plymouth County, Iowa
Map of Iowa highlighting Plymouth County
Location in the state of Iowa
Map of the United States highlighting Iowa
Iowa's location in the U.S.
Founded 1851
Seat Le Mars
Largest city Le Mars
 • Total 864 sq mi (2,238 km2)
 • Land 863 sq mi (2,235 km2)
 • Water 0.8 sq mi (2 km2), 0.1%
 • (2010) 24,986
 • Density 29/sq mi (11/km²)
Congressional district 4th
Time zone Central: UTC-6/-5
Website .us.ia.plymouth.cowww

Plymouth County is a county located in the U.S. state of Iowa. As of the 2010 census, the population was 24,986.[1] The county seat is Le Mars.[2] Plymouth County was named after Plymouth, Massachusetts.[3]

Plymouth County is part of the Sioux City, IA-NE-SD Metropolitan Statistical Area.


  • History 1
  • Geography 2
    • Adjacent counties 2.1
  • Transportation 3
    • Major highways 3.1
    • Airport 3.2
  • Demographics 4
    • 2010 census 4.1
    • 2000 census 4.2
  • Points of interest 5
  • Notable natives 6
  • Communities 7
    • Cities 7.1
    • Unincorporated communities 7.2
  • See also 8
  • References 9
  • External links 10


Plymouth County was formed on January 15, 1851. Settlement began in the county in 1856. In October, 1859, the first courthouse was built in Melbourne, formerly located in the southeast quarter of section 34, Plymouth Township, about five to six miles due south of Merrill.[4] The first public school opened its doors there with 32 pupils. In 1872, the county seat was moved to Le Mars and a new courthouse and a jail were built there in 1873. The courthouse in present use was built in 1900 of red sandstone.[5]

During the Great Depression, the farmers organized a group, which they named the Farmers Holiday Group. The goal was to keep farm products off the market until the desired price was met. A radical group among them abducted Judge Bradley from his court chamber and threatened to hang him in the front of the courthouse. Bradley was freed, but the governor ordered the national guard to Plymouth County and declared state of emergency, which meant the end of the Farmers Holiday Group.[5][6]


According to the U.S. Census Bureau, the county has a total area of 864 square miles (2,240 km2), of which 863 square miles (2,240 km2) is land and 0.8 square miles (2.1 km2) (0.1%) is water.[7] It is the fourth-largest county by area in Iowa.

Adjacent counties


Major highways


Le Mars Municipal Airport is located in Plymouth County, two nautical miles (3.7 km) southwest of the central business district of Le Mars, Iowa.


2010 census

The 2010 census recorded a population of 24,986 in the county, with a population density of 28.9337/sq mi (11.17137/km2). There were 10,550 housing units, of which 9,875 were occupied.[13]

2000 census

2000 Census Age Pyramid for Plymouth County

As of the census[14] of 2000, there were 24,849 people, 9,372 households, and 6,804 families residing in the county. The population density was 29 people per square mile (11/km²). There were 9,880 housing units at an average density of 11 per square mile (4/km²). The racial makeup of the county was 98.16% White, 0.29% Black or African American, 0.14% Native American, 0.27% Asian, 0.06% Pacific Islander, 0.46% from other races, and 0.62% from two or more races. 1.32% of the population were Hispanic or Latino of any race.

There were 9,372 households out of which 35.70% had children under the age of 18 living with them, 63.30% were married couples living together, 6.20% had a female householder with no husband present, and 27.40% were non-families. 24.00% of all households were made up of individuals and 12.00% had someone living alone who was 65 years of age or older. The average household size was 2.61 and the average family size was 3.12.

In the county the population was spread out with 28.30% under the age of 18, 7.20% from 18 to 24, 26.40% from 25 to 44, 22.00% from 45 to 64, and 16.00% who were 65 years of age or older. The median age was 38 years. For every 100 females there were 98.80 males. For every 100 females age 18 and over, there were 95.70 males.

The median income for a household in the county was $41,638, and the median income for a family was $50,009. Males had a median income of $33,566 versus $22,558 for females. The per capita income for the county was $19,442. About 4.40% of families and 6.00% of the population were below the poverty line, including 6.70% of those under age 18 and 6.40% of those age 65 or over.

Points of interest

The Pappas Telecasting Tower, with a height of 603.5 metres (1,980 ft), is one of the tallest masts in the world.

Notable natives



Unincorporated communities

  • Adaville
  • Brookdale
  • Crathorne
  • James
  • Mammen
  • Milnerville
  • Neptune
  • O'Leary
  • Plymouth
  • Potosia
  • Ruble
  • Seney
  • Union Center (Also known as "The U")
  • West Le Mars
  • Wren
  • Yeomans

See also


  1. ^ a b "State & County QuickFacts". United States Census Bureau. Retrieved July 20, 2014. 
  2. ^ "Find a County". National Association of Counties. Retrieved 2011-06-07. 
  3. ^ Chicago and North Western Railway Company (1908). A History of the Origin of the Place Names Connected with the Chicago & North Western and Chicago, St. Paul, Minneapolis & Omaha Railways. p. 163. 
  4. ^ History of the Counties of Woodbury and Plymouth, Iowa. Chicago: A. Warner & Co. 1890. p. 434. 
  5. ^ a b "Historical Facts About Plymouth County". Retrieved November 29, 2012. 
  6. ^ "Martial Law at Le Mars".  
  7. ^ "US Gazetteer files: 2010, 2000, and 1990".  
  8. ^ "Annual Estimates of the Resident Population for Incorporated Places: April 1, 2010 to July 1, 2014". Retrieved June 4, 2015. 
  9. ^ "U.S. Decennial Census". United States Census Bureau. Retrieved July 20, 2014. 
  10. ^ "Historical Census Browser". University of Virginia Library. Retrieved July 20, 2014. 
  11. ^ "Population of Counties by Decennial Census: 1900 to 1990". United States Census Bureau. Retrieved July 20, 2014. 
  12. ^ "Census 2000 PHC-T-4. Ranking Tables for Counties: 1990 and 2000" (PDF). United States Census Bureau. Retrieved July 20, 2014. 
  13. ^ "Population & Housing Occupancy Status 2010".  
  14. ^ "American FactFinder".  

External links

  • Plymouth County Iowa Official website
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