Mahaska County, Iowa Population 2024

21,777

Mahaska County, Iowa's estimated 2024 population is 21,777 with a growth rate of -0.44% in the past year according to the most recent United States census data. Mahaska County, Iowa is the 28th largest county in Iowa. The 2010 population was 22,409 and has seen a growth of -2.82% since that time.

Note: data after 2022 is projected based on recent change
Year
Population
Growth
Change
202921,292-97-0.45%
202821,389-97-0.45%
202721,486-97-0.45%
202621,583-97-0.45%
202521,680-97-0.45%
202421,777-97-0.44%
202321,874-97-0.44%
202221,971-3-0.01%
202121,974-186-0.84%
202022,160-269-1.2%
201922,4292261.02%
201822,203-219-0.98%
201722,422970.43%
201622,325-92-0.41%
201522,417-49-0.22%
201422,466340.15%
201322,432250.11%
201222,407-99-0.44%
201122,506970.43%
201022,40900%
199021,522-1,345-5.88%
198022,8676903.11%
197022,177-1,425-6.04%
196023,602-1,070-4.34%
195024,672-1,813-6.85%
194026,4856812.64%
193025,804-466-1.77%
192026,270-3,590-12.02%
191029,860-4,413-12.88%
190034,2735,46818.98%
189028,8053,60314.3%
188025,2022,69411.97%
187022,5087,69251.92%
186014,8168,827147.39%
18505,989-15,303-71.87%
2024 Growth Rate
-0.44% (-97)
County Website
Mahaska County
State
Iowa
County Seat
Oskaloosa
2020 Population
22,160
Area
571 mi²
Density
38 people/mi²
Growth Since 2020
-1.73% (-383)
Founded
1843

Population by Race

Race
Population
Percentage (of total)
White20,54093.17%
Two or more races7553.42%
Black or African American3381.53%
Asian2581.17%
Other race1230.56%
Native American300.14%
Native Hawaiian or Pacific Islander10%

White

Two or more races

Black or African American

Asian

Other race

Native American

Native Hawaiian or Pacific Islander

Mahaska County, Iowa Population by Race

Mahaska County, Iowa Population Pyramid 2024

Mahaska County, Iowa Median Age

39.1

Total

37.8

Male

40

Female

Mahaska County, Iowa Adults

There are 16,783 adults, (4,191 of whom are seniors) in Mahaska County, Iowa.

Mahaska County, Iowa Age Dependency

75.1

Age Dependency Ratio

33.3

Old Age Dependency Ratio

41.8

Child Dependency Ratio

Mahaska County, Iowa Sex Ratio

Female10,78848.94%
Male11,25751.06%

Mahaska County, Iowa Population by Age

Mahaska County, Iowa Renter vs Owner Occupied by Household Type

Household Type
Count
Average Size
Owner
Renter
All8,8912.467.832.2
Married4,5483.0382.917.1
Non Family3,1161.2352.747.3
Female7873.2146.553.5
Male4402.757.742.3

2.94

Average Family Size

2.4

Average Household Size

67.8%

Rate of Home Ownership

Married

Male

Female

NonFamily

owner

renter

Mahaska County, Iowa Households and Families

Male

Female

Education Attained
Count
Percentage
9th to 12th Grade5783.95%
Associates Degree1,92513.17%
Bachelors Degree2,49017.03%
Graduate Degree8735.97%
High School Graduate5,66338.73%
Less Than 9th Grade2952.02%
Some College2,79819.14%

Less Than 9th Grade

9th to 12th Grade

High School Graduate

Some College

Associates Degree

Bachelors Degree

Graduate Degree

Mahaska County, Iowa Educational Attainment by Sex (over 25)

Mahaska County, Iowa Educational Attainment by Race

High School Graduation Rate

Bachelors Rate

Race
Total
High School
Bachelors
White13,91313,1133,203
2+ Races24724251
Hispanic2131810
Asian18715589
Black1181150
Other Race654412
Native American888

The highest rate of high school graduation is among native american people with a rate of 100%.

The highest rate of bachelors degrees is among native american people with a rate of 100%.

Mahaska County, Iowa Educational Attainment by Race

All

Male

Female

Name
Average
Male
Female
Bachelors Degree$50,323$61,583$45,747
Graduate Degree$69,137$78,375$68,235
High School Graduate$40,149$52,006$27,357
Less Than 9th Grade$26,957$26,467$0
Overall$44,056$53,784$35,410
Some College$41,565$53,187$31,934

$44,056

Average Earnings

$53,784

Average Male

$35,410

Average Female

Mahaska County, Iowa Earnings by Educational Attainment

Mahaska County, Iowa Language by Age

Only English

Spanish

Other Indo-European Languages

Asian and Pacific Island Languages

Other Languages

Mahaska County, Iowa Language

97.46% of Mahaska County, Iowa residents speak only English, while 2.54% speak other languages. The non-English language spoken by the largest group is Spanish, which is spoken by 1.15% of the population.

Mahaska County, Iowa Language

Mahaska County, Iowa Poverty by Race

rate

Name
Total
In Poverty
Poverty Rate
White19,7572,35711.93%
Multiple72610314.19%
Hispanic4905611.43%
Native302273.33%
Other117119.4%
Black25593.53%
Asian25820.78%

11.85%

Overall Poverty Rate

10.43%

Male Poverty Rate

13.33%

Female Poverty Rate

Poverty in Mahaska County, Iowa

The race most likely to be in poverty in Mahaska County, Iowa is Native, with 73.33% below the poverty level.

The race least likely to be in poverty in Mahaska County, Iowa is Asian, with 0.78% below the poverty level.

The poverty rate among those that worked full-time for the past 12 months was 3.59%. Among those working part-time, it was 19.25%, and for those that did not work, the poverty rate was 17.24%.

Mahaska County, Iowa Poverty

rate

Rate
Poverty
Less Than 9th Grade22.51%
High School12.89%
Some College7.64%
Bachelors or Greater2.54%

Mahaska County, Iowa Poverty Rate by Education

rate

Rate
Poverty
Male Unemployed45.68%
Female Unemployed45.4%
Female Employed9.82%
Male Employed6.96%

Mahaska County, Iowa Poverty Rate by Employment Status and Sex

Mahaska County, Iowa Income by Household Type

Households

Families

MarriedFamilies

NonFamilies

Name
Median
Mean
Families$83,414$102,196
Households$69,019$84,768
Married Families$94,575$-999,999,999
Non Families$36,342$47,693

mean

median

Income by Household Type

Mahaska County, Iowa Marital Status

Married

Widowed

Divorced

Separated

NeverMarried

Marriage Rates

52.8%

Overall Marriage Rate

51.5%

Male Marriage Rate

54.1%

Female Marriage Rate

Mahaska County, Iowa Married by Age and Sex

male

female

Mahaska County, Iowa Marriage

The age group where males are most likely to be married is 55-64, while the female age group most likely to be married is 45-54.

Mahaska County, Iowa Marital Status by Race

Married

Widowed

Divorced

Separated

NeverMarried

Mahaska County, Iowa Marital Status

Second Gulf War

First Gulf War

Vietnam

Korea

World War II

995

Number of Veterans

924

Male Veterans

71

Female Veterans

War
Veterans
Vietnam351
Second Gulf War188
First Gulf War186
Korea75
World War II41

Mahaska County, Iowa Veterans by War

count

Age Group
Veterans
75+317
65 to 74211
35 to 54199
55 to 64187
18 to 3481

Mahaska County, Iowa Veterans by Age

count

Name
Veterans
% of Total
White9626.09%
2+ Races246.49%
Hispanic185.16%
Asian94.13%

Mahaska County, Iowa Veterans by Race

Mahaska County, Iowa Veterans by Education

Less Than 9th Grade

High School Graduate

Some College

Bachelors or Greater

4.54%

Veteran Poverty Rate

29.37%

Veteran Disability Rate

Mahaska County, Iowa Veterans by Education

LaborForceParticipation

66.9%

Labor Force Participation

64.7%

Employment Rate

3.3%

Unemployment Rate

Mahaska County, Iowa Employment by Age

LaborForceParticipation

Mahaska County, Iowa Employment by Race

LaborForceParticipation

Mahaska County, Iowa Employment by Education

Origin of Non-Citizens

Europe

Asia

Africa

Oceania

Latin America

North America

Non citizens include legal permanent residents (green card holders), international students, temporary workers, humanitarian migrants, and illegal immigrants.

Origin of Naturalized Citizens

Europe

Asia

Africa

Oceania

Latin America

North America

79.48%

Born in Mahaska County, Iowa

97.91%

Native Born

2.09%

Foreign Born

1.11%

Non Citizen

0.98%

Naturalized

Place of Birth

97.91% of Mahaska County, Iowa residents were born in the United States, with 79.48% having been born in Iowa. 1.11% of residents are not US citizens. Of those not born in the United States, the largest percentage are from Asia.

Mahaska County, Iowa Place of Birth

Sources