Jefferson County, Iowa Population 2024

15,570

Jefferson County, Iowa's estimated 2024 population is 15,570 with a growth rate of -0.41% in the past year according to the most recent United States census data. Jefferson County, Iowa is the 48th largest county in Iowa. The 2010 population was 16,835 and has seen a growth of -7.51% since that time.

Note: data after 2022 is projected based on recent change

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Year
Population
Growth
Growth Rate
202915,250-64-0.42%
202815,314-64-0.42%
202715,378-64-0.41%
202615,442-64-0.41%
202515,506-64-0.41%
202415,570-64-0.41%
202315,634-64-0.41%
202215,698-64-0.41%
202115,762690.44%
202015,693-2,487-13.68%
201918,180780.43%
201818,102-6-0.03%
201718,108810.45%
201618,0271140.64%
201517,9131180.66%
201417,7951630.92%
201317,6323512.03%
201217,2811821.06%
201117,0992641.57%
201016,835
199016,310-6-0.04%
198016,3165423.44%
197015,774-44-0.28%
196015,8181220.78%
195015,696-66-0.42%
194015,762-479-2.95%
193016,241-199-1.21%
192016,4404893.07%
191015,951-1,486-8.52%
190017,4372,25314.84%
189015,184-2,285-13.08%
188017,469-370-2.07%
187017,8392,80118.63%
186015,0385,13451.84%
18509,9047,131257.16%
18402,773-12,477-81.82%
showing: 36 rows
2024 Growth Rate
-0.41% (-64)
County Website
Jefferson County
State
Iowa
County Seat
2010 Population
16,835
Area
436 mi²
Density
36 people/mi²
Growth Since 2010
-7.51% (-1,265)
Founded
1839

Jefferson County, Iowa Population 2024

Population by Race

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Race
Population
Percentage (of total)
White13,51485.61%
Asian9315.9%
Black or African American7614.82%
Two or more races3952.5%
Native American1240.79%
Other race600.38%
Native Hawaiian or Pacific Islander
showing: 7 rows

White

Asian

Black or African American

Two or more races

Native American

Other race

Native Hawaiian or Pacific Islander

Jefferson County, Iowa Population by Race

Jefferson County, Iowa Population Pyramid 2024

Jefferson County, Iowa Median Age

44.2

Total

42.6

Male

48.4

Female

Jefferson County, Iowa Adults

There are 13,192 adults, (3,990 of whom are seniors) in Jefferson County, Iowa.

Jefferson County, Iowa Age Dependency

71.5

Age Dependency Ratio

43.4

Old Age Dependency Ratio

28.2

Child Dependency Ratio

Jefferson County, Iowa Sex Ratio

Female7,49247.46%
Male8,29352.54%

Jefferson County, Iowa Population by Age

Jefferson County, Iowa Renter vs Owner Occupied by Household Type

Household Type
Count
Average Size
Owner
Renter
All6,8262.1765.434.6
Non Family3,0281.2451.448.6
Married2,8952.7981.718.3
Female4993.7661.538.5
Male4042.7458.741.3
showing: 5 rows

2.79

Average Family Size

2.17

Average Household Size

65.4%

Rate of Home Ownership

Married

Male

Female

NonFamily

owner

renter

Jefferson County, Iowa Households and Families

Male

Female

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Less Than 9th Grade

9th to 12th Grade

High School Graduate

Some College

Associates Degree

Bachelors Degree

Graduate Degree

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

Jefferson County, Iowa Educational Attainment by Race

High School Graduation Rate

Bachelors Rate

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The highest rate of high school graduation is among other race people with a rate of 100%.

The highest rate of bachelors degrees is among other race people with a rate of 94.59%.

Jefferson County, Iowa Educational Attainment by Race

All

Male

Female

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$33,233

Average Earnings

$38,097

Average Male

$27,554

Average Female

Jefferson County, Iowa Earnings by Educational Attainment

Jefferson County, Iowa Language by Age

Only English

Spanish

Other Indo-European Languages

Asian and Pacific Island Languages

Other Languages

Jefferson County, Iowa Language

86.46% of Jefferson County, Iowa residents speak only English, while 13.54% speak other languages. The non-English language spoken by the largest group is Other Indo-European, which is spoken by 4.34% of the population.

Jefferson County, Iowa Language

Jefferson County, Iowa Poverty by Race

rate

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Name
Total
In Poverty
Poverty Rate
White12,5901,49411.87%
Asian82231738.56%
Hispanic53416530.9%
Black5929415.88%
Native1189277.97%
Multiple31541.27%
showing: 6 rows

13.97%

Overall Poverty Rate

13.75%

Male Poverty Rate

14.2%

Female Poverty Rate

Poverty in Jefferson County, Iowa

The race most likely to be in poverty in Jefferson County, Iowa is Native, with 77.97% below the poverty level.

The race least likely to be in poverty in Jefferson County, Iowa is Multiple, with 1.27% below the poverty level.

The poverty rate among those that worked full-time for the past 12 months was 1.33%. Among those working part-time, it was 17.7%, and for those that did not work, the poverty rate was 24.2%.

Jefferson County, Iowa Poverty

rate

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Rate
Poverty
Less Than 9th Grade27.77%
Bachelors or Greater15.03%
Some College14.33%
High School8.1%
showing: 4 rows

Jefferson County, Iowa Poverty Rate by Education

rate

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Rate
Poverty
Female Unemployed40%
Male Unemployed23.55%
Female Employed10.7%
Male Employed4.99%
showing: 4 rows

Jefferson County, Iowa Poverty Rate by Employment Status and Sex

Jefferson County, Iowa Income by Household Type

Households

Families

MarriedFamilies

NonFamilies

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mean

median

Income by Household Type

Jefferson County, Iowa Marital Status

Married

Widowed

Divorced

Separated

NeverMarried

Marriage Rates

45.2%

Overall Marriage Rate

41.6%

Male Marriage Rate

49.2%

Female Marriage Rate

Jefferson County, Iowa Married by Age and Sex

male

female

Jefferson County, Iowa Marriage

The age group where males are most likely to be married is Over 65, while the female age group most likely to be married is 35-44.

Jefferson County, Iowa Marital Status by Race

Married

Widowed

Divorced

Separated

NeverMarried

Jefferson County, Iowa Marital Status

Second Gulf War

First Gulf War

Vietnam

Korea

World War II

1,122

Number of Veterans

1,011

Male Veterans

111

Female Veterans

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Jefferson County, Iowa Veterans by War

count

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Jefferson County, Iowa Veterans by Age

count

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Jefferson County, Iowa Veterans by Race

Jefferson County, Iowa Veterans by Education

Less Than 9th Grade

High School Graduate

Some College

Bachelors or Greater

7.13%

Veteran Poverty Rate

22.67%

Veteran Disability Rate

Jefferson County, Iowa Veterans by Education

LaborForceParticipation

59.7%

Labor Force Participation

56.6%

Employment Rate

5.2%

Unemployment Rate

Jefferson County, Iowa Employment by Age

LaborForceParticipation

Jefferson County, Iowa Employment by Race

LaborForceParticipation

Jefferson 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

56.26%

Born in Jefferson County, Iowa

88.08%

Native Born

11.92%

Foreign Born

9.16%

Non Citizen

2.76%

Naturalized

Place of Birth

88.08% of Jefferson County, Iowa residents were born in the United States, with 56.26% having been born in Iowa. 9.16% of residents are not US citizens. Of those not born in the United States, the largest percentage are from Asia.

Jefferson County, Iowa Place of Birth

Sources