Jefferson County, Iowa Population 2021

Jefferson County, Iowa's estimated population is 18,373 with a growth rate of 0.21% in the past year according to the most recent United States census data. Jefferson County, Iowa is the 40th largest county inIowa. The 2010 Population was 16,837 and has seen a growth of 9.12% since this time.

Note: 2020 and 2021 data is projected
Year Population Growth Annual Growth Rate
202118,373390.21%
202018,334390.21%
201918,295390.21%
201818,256370.20%
201718,2191560.86%
201618,0631570.88%
201517,9061130.64%
201417,7931640.93%
201317,6293512.03%
201217,2781821.06%
201117,0962591.54%
201016,8375273.23%
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%
18402,7730.00%
2021 Growth Rate
0.21% (39)
County Website
State
Founded
1839
County Seat
2010 Population
16,837
Growth Since 2010
9.12% (1,536)
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Jefferson County, Iowa Population Growth

Population by Race

Race Population Percentage
White15,10483.23%
Black or African American1,3057.19%
Asian7904.35%
Two or More Races6943.82%
Some Other Race2521.39%
American Indian and Alaska Native30.02%
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Jefferson County, Iowa Population by Race

Jefferson County, Iowa Population Pyramid $2021

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Jefferson County, Iowa Median Age

42.9


Total

42.2


Male

43.3


Female

Jefferson County, Iowa Adults

There are 15,281 adults, (3,915 of whom are seniors) in Jefferson County, Iowa.

Jefferson County, Iowa Age Dependency

59.7

Age Dependency Ratio

34.4

Old Age Dependency Ratio

25.2

Child Dependency Ratio

Jefferson County, Iowa Sex Ratio

Female

9,259

51.02%

Male

8,889

48.98%

Jefferson County, Iowa Population by Age

Jefferson County, Iowa Renter vs Owner Occupied by Household Type

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Jefferson County, Iowa Household Types

Type Owner Renter
Non Family51.8%48.2%
Male52.8%47.2%
Female53.6%46.4%
All66.3%33.7%
Married82.4%17.6%

66.3%

Rate of Home Ownership

Jefferson County, Iowa Households and Families

Type Count Average Size Owned
All6,7542.5466.3
Married3,1573.0282.4
Non Family2,6811.2651.8
Female547553.6
Male3694.1152.8

3.19

Average Family Size

2.54

Average Household Size

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Jefferson County, Iowa Households by Type

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Education Attained Count Percentage
Less Than 9th Grade1961.44%
9th to 12th Grade7325.37%
High School Graduate3,81227.96%
Some College3,07022.51%
Associates Degree1,53211.23%
Bachelors Degree2,40317.62%
Graduate Degree1,89113.87%
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Jefferson County, Iowa Educational Attainment by Sex (over 25)

Jefferson County, Iowa Educational Attainment by Race

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Race Total High School Bachelors
White11,13710,2783,405
Black1,1411,140130
Asian593569449
Hispanic373329150
2+ Races26826873
Other Race171171113
Native American33

The highest rate of high school graduation is among native american people with a rate of 100.00%.

The highest rate of bachelors degrees is among asian people with a rate of 75.72%.

Jefferson County, Iowa Educational Attainment by Race

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Name Average Male Female
Overall$30,822$40,441$21,503
Less Than 9th Grade$21,594$$21,284
High School Graduate$38,633$40,685$26,910
Some College$25,449$35,511$20,775
Bachelors Degree$34,744$43,214$22,900
Graduate Degree$31,402$42,232$

$30,822

Average Earnings

$40,441

Average Male

$21,503

Average Female

Jefferson County, Iowa Earnings by Educational Attainment

Jefferson County, Iowa Language by Age

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Jefferson County, Iowa Language

90.59% of Jefferson County, Iowa residents speak only English, while 9.41% speak other languages. The non-English language spoken by the largest group is Other Indo-European, which is spoken by 3.99% of the population.

Jefferson County, Iowa Language

Jefferson County, Iowa Poverty by Race

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Name Total In Poverty Poverty Rate
White14,3201,69111.81%
Hispanic49213928.25%
Asian57412722.13%
Black1,175847.15%
Other573459.65%
Multiple689243.48%

12.09%

Overall Poverty Rate

10.79%

Male Poverty Rate

13.27%

Female Poverty Rate

Poverty in Jefferson County, Iowa

The race most likely to be in poverty in Jefferson County, Iowa is Other, with 59.65% below the poverty level.

The race least likely to be in poverty in Jefferson County, Iowa is Multiple, with 3.48% below the poverty level.

The poverty rate among those that worked full-time for the past 12 months was 1.70%. Among those working part-time, it was 15.49%, and for those that did not work, the poverty rate was 24.72%.

Jefferson County, Iowa Poverty

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Name Poverty
Less Than 9th Grade17.55%
Bachelors or Greater14.76%
Some College10.09%
High School9.32%

Jefferson County, Iowa Poverty Rate by Education

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Rate Poverty
Female Unemployed73.47%
Male Unemployed31.13%
Female Employed9.13%
Male Employed3.55%

Jefferson County, Iowa Poverty Rate by Employment Status and Sex

Jefferson County, Iowa Income by Household Type

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Name Median Mean
Households$47,708$68,141
Families$59,925$85,840
Married Families$69,834-
Non Families$25,243$37,836
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Income by Household Type

Jefferson County, Iowa Marital Status

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Marriage Rates

42.8%

Overall Marriage Rate

42.0%

Male Marriage Rate

43.6%

Female Marriage Rate

Jefferson County, Iowa Married by Age and Sex

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Jefferson County, Iowa Marriage

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

Jefferson County, Iowa Marital Status by Race

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Jefferson County, Iowa Marital Status

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1,533

Number of Veterans

1,484

Male Veterans

49

Female Veterans

War Veterans
Vietnam470
Second Gulf War447
First Gulf War217
Korea97
World War II46

Jefferson County, Iowa Veterans by War

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Age Group Veterans
35 to 54726
65 to 74460
75+277
55 to 6463
18 to 347

Jefferson County, Iowa Veterans by Age

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Name Veterans % of Total
White1,1188.95%
Black40034.25%
Hispanic246.19%
2+ Races152.44%

Jefferson County, Iowa Veterans by Race

Jefferson County, Iowa Veterans by Education

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3.23%

Veteran Poverty Rate

21.64%

Veteran Disability Rate

Jefferson County, Iowa Veterans by Education

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62.3%

Labor Force Participation

58.1%

Employment Rate

6.6%

Unemployment Rate

Jefferson County, Iowa Employment by Age

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Jefferson County, Iowa Employment by Race

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Jefferson County, Iowa Employment by Education

Origin of Non-Citizens

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

Origin of Naturalized Citizens

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57.28%

Born in Jefferson County, Iowa

90.71%

Native Born

9.29%

Foreign Born

7.44%

Non Citizen

1.85%

Naturalized

Place of Birth

90.71% of Jefferson County, Iowa residents were born in the United States, with 57.28% having been born in Iowa. 7.44% 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

  1. US Census City/Town Population estimates - Most recent state estimates from the Census Bureau's Population Estimates Program
  2. Population of States and Counties of the United States: 1790 - 1990

Sources