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Mahaska County, Iowa
Mahaska County, Iowa Courthouse.jpg
The courthouse in Oskaloosa is on the NRHP. The architect was Henry C. Koch in 1886
Map of Iowa highlighting Mahaska County
Location in the state of Iowa
Map of the United States highlighting Iowa
Iowa's location in the U.S.
Founded 1843
Named for Mahaska
Seat Oskaloosa
Largest city Oskaloosa
 • Total 573 sq mi (1,484 km2)
 • Land 571 sq mi (1,479 km2)
 • Water 2.5 sq mi (6 km2), 0.4%
 • (2010) 22,381
 • Density 39/sq mi (15/km²)
Congressional district 2nd
Time zone Central: UTC-6/-5
Website www.mahaskacounty.org

Mahaska County is a county located in the U.S. state of Iowa. As of the 2010 census, the population was 22,335.[1] The county seat is Oskaloosa.[2]

Mahaska County comprises the Oskaloosa, IA Micropolitan Statistical Area.


Mahaska, from Futon's Red Men of Iowa 1882.

Mahaska County was formed on February 17, 1843. The county has been self-governing since February 5, 1844. It was named after Chief Mahaska of the Iowa tribe. The county was the first in Iowa to have a sheriff and a justice of peace.[3]

The first courthouse was completed in January, 1846. The second structure was put into use on February 27, 1886. The first school, a small log cabin one-half mile (ca. 2 km) east of Oskaloosa, was opened on September 16, 1844 and the Cumberland Presbyterian Church opened as the first church in 1846.[4] On July 2, 1850, the first edition of the Iowa Herald was issued (today the Oskaloosa Herald). In 1864, the first tracks were laid through the county of the Des Moines Valley Railroad.[3]

Coal mining was once a major industry in Mahaska County.[5] In the 19th century, Muchakinock, about 5 miles (8.0 km) south of Oskaloosa, was probably the largest and most prosperous coal camp in Iowa.


According to the U.S. Census Bureau, the county has a total area of 573 square miles (1,480 km2), of which 571 square miles (1,480 km2) is land and 2.5 square miles (6.5 km2) (0.4%) is water.[6]

Major highways[edit]

Adjacent counties[edit]


Historical population
Census Pop.
1850 5,989
1860 14,816 147.4%
1870 22,508 51.9%
1880 25,202 12.0%
1890 28,805 14.3%
1900 34,273 19.0%
1910 29,860 −12.9%
1920 26,270 −12.0%
1930 25,804 −1.8%
1940 26,485 2.6%
1950 24,672 −6.8%
1960 23,602 −4.3%
1970 22,177 −6.0%
1980 22,867 3.1%
1990 21,532 −5.8%
2000 22,335 3.7%
2010 22,381 0.2%
Est. 2013 22,417 0.2%
U.S. Decennial Census[7]
1790-1960[8] 1900-1990[9]
1990-2000[10] 2010-2013[1]

2010 census[edit]

The 2010 census recorded a population of 22,381 in the county, with a population density of 39.2051/sq mi (15.1372/km2). There were 9,766 housing units, of which 8,975 were occupied.[11]

2000 census[edit]

2000 Census Age Pyramid for Mahaska County

As of the census[12] of 2000, there were 22,335 people, 8,880 households, and 6,144 families residing in the county. The population density was 39 people per square mile (15/km²). There were 9,551 housing units at an average density of 17 per square mile (6/km²). The racial makeup of the county was 97.20% White, 0.64% Black or African American, 0.19% Native American, 0.86% Asian, 0.03% Pacific Islander, 0.30% from other races, and 0.78% from two or more races. 0.85% of the population were Hispanic or Latino of any race.

There were 8,880 households out of which 32.40% had children under the age of 18 living with them, 58.60% were married couples living together, 7.50% had a female householder with no husband present, and 30.80% were non-families. 26.60% of all households were made up of individuals and 12.40% had someone living alone who was 65 years of age or older. The average household size was 2.45 and the average family size was 2.96.

In the county the population was spread out with 25.70% under the age of 18, 9.40% from 18 to 24, 26.80% from 25 to 44, 21.70% from 45 to 64, and 16.30% who were 65 years of age or older. The median age was 37 years. For every 100 females there were 99.10 males. For every 100 females age 18 and over, there were 96.90 males.

The median income for a household in the county was $37,314, and the median income for a family was $43,557. Males had a median income of $32,618 versus $23,192 for females. The per capita income for the county was $18,232. About 7.50% of families and 9.80% of the population were below the poverty line, including 11.70% of those under age 18 and 9.30% of those age 65 or over.



Unincorporated communities[edit]

See also[edit]


  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. ^ a b Mahaska County
  4. ^ About Mahaska
  5. ^ Map of Historic Coal Mines in Mahaska County, Mahaska 4-H Tech Team, May 2006.
  6. ^ "US Gazetteer files: 2010, 2000, and 1990". United States Census Bureau. 2011-02-12. Retrieved 2011-04-23. 
  7. ^ "U.S. Decennial Census". United States Census Bureau. Retrieved July 20, 2014. 
  8. ^ "Historical Census Browser". University of Virginia Library. Retrieved July 20, 2014. 
  9. ^ "Population of Counties by Decennial Census: 1900 to 1990". United States Census Bureau. Retrieved July 20, 2014. 
  10. ^ "Census 2000 PHC-T-4. Ranking Tables for Counties: 1990 and 2000" (PDF). United States Census Bureau. Retrieved July 20, 2014. 
  11. ^ "Population & Housing Occupancy Status 2010". United States Census Bureau American FactFinder. Retrieved May 23, 2011. 
  12. ^ "American FactFinder". United States Census Bureau. Retrieved 2008-01-31. 

External links[edit]

Coordinates: 41°20′02″N 92°38′44″W / 41.33389°N 92.64556°W / 41.33389; -92.64556

Original courtesy of Wikipedia: http://en.wikipedia.org/wiki/Mahaska_County,_Iowa — Please support Wikipedia.
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3545 videos foundNext > 


Corn Harvest 2012: Mark Jackson (Mahaska County, Iowa)

It's been a tough year for corn. The summer was hot and dry and now farmers are finding out just how much damage the drought has caused on the corn.

2011 Abandoned Mine Land Reclamation Award: Westercamp AML Project, Mahaska County, Iowa

The Office of Surface Mining (OSM) recognizes outstanding abandoned mine land reclamation in the United States every year. The Westercamp AML Reclamation Project in Mahaska County, Iowa was.

2011 Soybean Harvest in Mahaska County Iowa

Time to pick the beans.

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Mesothelioma Lawyer Mahaska County, IA (800) 859-6164 Iowa Hi, My name is Chris Placitella. My office and myself have represented asbestosis victims and their families devastated by injury...

Corn and Soybeans 2010 Growing Season in Mahaska County, Iowa

A series from the 2010 corn and soybean growing season in Mahaska County, Iowa. (Aired on CRI Weekly News) Visit: www.criwmpennu.org.

USA. 15-08-2007. Evans (Iowa). Mahaska County.

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Court Reporter Mahaska County, IA (866) 357-1796 Iowa

Court Reporter Mahaska County, IA (866) 357-1796 Iowa Call us toll free: (800) 859-6164 http://www.courtreportingagency.com Professional Court Reporting and video is a full-service court...

Meet the Iowa Lottery's Newest Multi-Millionaire!

Mahaska County man claims $2 million Powerball prize from the March 23 drawing. Congratulations to Michael Lally of Barnes City!

3545 videos foundNext > 

27 news items

Mon, 27 Oct 2014 13:26:15 -0700

OSKALOOSA, IOWA -- A New Sharon man suffered minor injuries in a hunting accident Sunday morning. According to the Iowa Department of Natural Resources, Kevin Flander, 51, sustained injuries to his face, chest and hand when he was hit by shotgun ...


Wed, 18 Feb 2015 13:19:18 -0800

MAHASKA COUNTY, IOWA -- Two men have been accused of stealing and selling livestock in southeast Iowa. The Mahaska County Sheriff's Department arrested Bret Doty, 19, of Malcom, as well as one minor. They were both charged with theft and burglary ...
Thu, 05 Jul 2012 14:45:45 -0700

OSKALOOSA, IOWA -- On Thursday afternoon, The Mahaska County Sheriff's Office informed KTVO that five suspects were taken into custody as the result of an on-going investigation. According to the sheriff's office, three search warrants were executed on ...
Sun, 28 Aug 2011 21:34:02 -0700

MAHASKA COUNTY, Iowa - One person is dead and two others are injured after a crash in Mahaska County. The Iowa State Patrol confirms Benjamin Coffman, 32, of Williamsburg, died in the crash. It happened Sunday afternoon around 1:15 on Highway 92.

KCCI Des Moines

KCCI Des Moines
Sun, 16 Nov 2014 13:09:45 -0800

An Oskaloosa man led authorities on a wild, high speed chase through the snow this morning. KCCI's Jason Rantala is live with the interesting way law enforcement caught their suspect. Todd, Police say the suspect blew stop signs while dodging drivers, ...


Thu, 24 Jul 2014 15:13:42 -0700

MAHASKA COUNTY,Iowa – Initial plans for the proposed South Central Regional Airport near Oskaloosa have been sent to the Federal Aviation Administration for review. The proposed $35 million project is to be built north of Oskaloosa next to Highway 163.

ConnectTriStates.com powered by KHQA

ConnectTriStates.com powered by KHQA
Thu, 06 Nov 2014 13:45:00 -0800

DES MOINES, IOWA -- A What Cheer, Iowa man will spend 60 days in prison for killing a bald eagle. Our sister station KTVO reports that 36-year-old Jason John Thomas received the sentence in federal court on Thursday. According to U.S. Attorney Kicholas ...


Wed, 15 Oct 2014 20:28:23 -0700

MAHASKA COUNTY, Iowa –A former state employee turned herself in to face charges of stealing taxpayer money. Jessica Strasser was the former secretary for the Mahaska County Soil and Water Conservation District. An investigation by the State Auditor's ...

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