Jefferson County, Iowa Population 2024

15,212

Jefferson County, Iowa's estimated 2024 population is 15,212 with a growth rate of -1.48% in the past year according to the most recent United States census data. Jefferson County, Iowa is the 49th largest county in Iowa. The 2010 population was 16,835 and has seen a growth of -9.64% since that time.

Note: data after 2022 is projected based on recent change
Year
Population
Growth
Change
202914,072-228-1.59%
202814,300-228-1.57%
202714,528-228-1.55%
202614,756-228-1.52%
202514,984-228-1.5%
202415,212-228-1.48%
202315,440-228-1.46%
202215,668-113-0.72%
202115,781870.55%
202015,694-2,486-13.67%
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%
201016,83500%
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%
18402,773-11,299-80.29%
2024 Growth Rate
-1.48% (-228)
County Website
Jefferson County
State
Iowa
County Seat
Fairfield
2020 Population
15,694
Area
436 mi²
Density
35 people/mi²
Growth Since 2020
-3.07% (-482)
Founded
1839

Population by Race

Race
Population
Percentage (of total)
White13,26984.65%
Black or African American9325.95%
Asian7234.61%
Two or more races4853.09%
Other race1350.86%
Native American1320.84%
Native Hawaiian or Pacific Islander00%

White

Black or African American

Asian

Two or more races

Other race

Native American

Native Hawaiian or Pacific Islander

Jefferson County, Iowa Population by Race

Jefferson County, Iowa Population Pyramid 2024

Jefferson County, Iowa Median Age

43.5

Total

41.2

Male

46.3

Female

Jefferson County, Iowa Adults

There are 12,992 adults, (4,033 of whom are seniors) in Jefferson County, Iowa.

Jefferson County, Iowa Age Dependency

75

Age Dependency Ratio

45

Old Age Dependency Ratio

30

Child Dependency Ratio

Jefferson County, Iowa Sex Ratio

Female7,60548.51%
Male8,07151.49%

Jefferson County, Iowa Population by Age

Jefferson County, Iowa Renter vs Owner Occupied by Household Type

Household Type
Count
Average Size
Owner
Renter
All6,8782.1465.134.9
Non Family3,1521.2147.152.9
Married2,9892.8784.615.4
Female4353.3957.242.8
Male3022.7271.528.5

2.82

Average Family Size

2.14

Average Household Size

65.1%

Rate of Home Ownership

Married

Male

Female

NonFamily

owner

renter

Jefferson County, Iowa Households and Families

Male

Female

Education Attained
Count
Percentage
9th to 12th Grade3482.96%
Associates Degree1,46512.45%
Bachelors Degree2,74623.34%
Graduate Degree2,15118.29%
High School Graduate2,77723.61%
Less Than 9th Grade1951.66%
Some College2,08117.69%

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

Race
Total
High School
Bachelors
White10,0709,5793,853
Black676676421
Asian591563438
2+ Races222219106
Hispanic16414868
Other Race938728
Native American645951

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

The highest rate of bachelors degrees is among native american people with a rate of 79.69%.

Jefferson County, Iowa Educational Attainment by Race

All

Male

Female

Name
Average
Male
Female
Bachelors Degree$37,500$41,971$29,592
Graduate Degree$31,653$31,995$24,808
High School Graduate$45,117$48,915$27,750
Less Than 9th Grade$21,684$0$21,449
Overall$35,877$41,760$30,176
Some College$35,881$39,828$32,163

$35,877

Average Earnings

$41,760

Average Male

$30,176

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

87.46% of Jefferson County, Iowa residents speak only English, while 12.54% speak other languages. The non-English language spoken by the largest group is Other languages, which is spoken by 4.22% of the population.

Jefferson County, Iowa Language

Jefferson County, Iowa Poverty by Race

rate

Name
Total
In Poverty
Poverty Rate
White12,4221,47711.89%
Asian57730853.38%
Multiple42513231.06%
Black74011215.14%
Hispanic58510718.29%
Native1278466.14%
Other11786.84%

14.55%

Overall Poverty Rate

15.23%

Male Poverty Rate

13.89%

Female Poverty Rate

Poverty in Jefferson County, Iowa

The race most likely to be in poverty in Jefferson County, Iowa is Native, with 66.14% below the poverty level.

The race least likely to be in poverty in Jefferson County, Iowa is Other, with 6.84% below the poverty level.

The poverty rate among those that worked full-time for the past 12 months was 2.06%. Among those working part-time, it was 17.33%, and for those that did not work, the poverty rate was 23.41%.

Jefferson County, Iowa Poverty

rate

Rate
Poverty
Less Than 9th Grade33.21%
Bachelors or Greater16.65%
Some College13.97%
High School7.6%

Jefferson County, Iowa Poverty Rate by Education

rate

Rate
Poverty
Female Unemployed35%
Male Unemployed16.8%
Female Employed8.39%
Male Employed6.99%

Jefferson County, Iowa Poverty Rate by Employment Status and Sex

Jefferson County, Iowa Income by Household Type

Households

Families

MarriedFamilies

NonFamilies

Name
Median
Mean
Families$78,622$100,743
Households$56,824$78,591
Married Families$91,578$-999,999,999
Non Families$32,917$50,190

mean

median

Income by Household Type

Jefferson County, Iowa Marital Status

Married

Widowed

Divorced

Separated

NeverMarried

Marriage Rates

47.3%

Overall Marriage Rate

45.7%

Male Marriage Rate

48.9%

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

1,038

Number of Veterans

954

Male Veterans

84

Female Veterans

War
Veterans
Second Gulf War333
First Gulf War294
Vietnam231
Korea30
World War II6

Jefferson County, Iowa Veterans by War

count

Age Group
Veterans
35 to 54461
75+205
65 to 74196
55 to 6497
18 to 3479

Jefferson County, Iowa Veterans by Age

count

Name
Veterans
% of Total
White8928.03%
Black12616.13%
2+ Races155.86%
Hispanic71.63%
Other Race32.61%
Asian20.3%

Jefferson County, Iowa Veterans by Race

Jefferson County, Iowa Veterans by Education

Less Than 9th Grade

High School Graduate

Some College

Bachelors or Greater

7.28%

Veteran Poverty Rate

15.79%

Veteran Disability Rate

Jefferson County, Iowa Veterans by Education

LaborForceParticipation

60.7%

Labor Force Participation

57.5%

Employment Rate

5.3%

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

57.21%

Born in Jefferson County, Iowa

88.2%

Native Born

11.8%

Foreign Born

8.68%

Non Citizen

3.12%

Naturalized

Place of Birth

88.2% of Jefferson County, Iowa residents were born in the United States, with 57.21% having been born in Iowa. 8.68% 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