Jefferson County, Kansas Population 2024

18,300

Jefferson County, Kansas's estimated 2024 population is 18,300 with a growth rate of -0.15% in the past year according to the most recent United States census data. Jefferson County, Kansas is the 30th largest county in Kansas. The 2010 population was 19,120 and has seen a growth of -4.29% since that time.

Note: data after 2022 is projected based on recent change

34 Rows

Year
Population
Growth
Change
202918,165-27-0.15%
202818,192-27-0.15%
202718,219-27-0.15%
202618,246-27-0.15%
202518,273-27-0.15%
202418,300-27-0.15%
202318,327-27-0.15%
202218,354-75-0.41%
202118,4291060.58%
202018,323-842-4.39%
201919,1652641.4%
201818,901-34-0.18%
201718,935970.51%
201618,838490.26%
201518,789-9-0.05%
201418,798310.17%
201318,767-91-0.48%
201218,858-83-0.44%
201118,941-179-0.94%
201019,12000%
199015,9056984.59%
198015,2073,26227.31%
197011,9456936.16%
196011,2521681.52%
195011,084-1,634-12.85%
194012,718-1,411-9.99%
193014,129-621-4.21%
192014,750-1,076-6.8%
191015,826-1,707-9.74%
190017,5339135.49%
189016,6201,0576.79%
188015,5633,03724.25%
187012,5268,067180.92%
18604,459-13,706-75.45%
2024 Growth Rate
-0.15% (-27)
County Website
Jefferson County
State
Kansas
County Seat
Oskaloosa
2020 Population
18,323
Area
533 mi²
Density
34 people/mi²
Growth Since 2020
-0.13% (-23)
Founded
August 25, 1855

Population by Race

Race
Population
Percentage (of total)
White17,24793.8%
Two or more races8034.37%
Black or African American1370.75%
Native American1000.54%
Other race560.3%
Asian440.24%
Native Hawaiian or Pacific Islander00%

White

Two or more races

Black or African American

Native American

Other race

Asian

Native Hawaiian or Pacific Islander

Jefferson County, Kansas Population by Race

Jefferson County, Kansas Population Pyramid 2024

Jefferson County, Kansas Median Age

43.2

Total

42.7

Male

43.6

Female

Jefferson County, Kansas Adults

There are 14,266 adults, (3,500 of whom are seniors) in Jefferson County, Kansas.

Jefferson County, Kansas Age Dependency

70.8

Age Dependency Ratio

32.5

Old Age Dependency Ratio

38.3

Child Dependency Ratio

Jefferson County, Kansas Sex Ratio

Female9,08849.43%
Male9,29950.57%

Jefferson County, Kansas Population by Age

Jefferson County, Kansas Renter vs Owner Occupied by Household Type

Household Type
Count
Average Size
Owner
Renter
All7,3162.488515
Married4,2623.0593.46.6
Non Family2,2831.2473.726.3
Female5373.0369.830.2
Male2343.0475.624.4

3.01

Average Family Size

2.48

Average Household Size

85.0%

Rate of Home Ownership

Married

Male

Female

NonFamily

owner

renter

Jefferson County, Kansas Households and Families

Male

Female

Education Attained
Count
Percentage
9th to 12th Grade3292.54%
Associates Degree1,0748.28%
Bachelors Degree1,98015.27%
Graduate Degree1,1979.23%
High School Graduate4,91337.89%
Less Than 9th Grade2271.75%
Some College3,24725.04%

Less Than 9th Grade

9th to 12th Grade

High School Graduate

Some College

Associates Degree

Bachelors Degree

Graduate Degree

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

Jefferson County, Kansas Educational Attainment by Race

High School Graduation Rate

Bachelors Rate

Race
Total
High School
Bachelors
White12,11011,6252,981
2+ Races45338562
Hispanic36832368
Black989729
Native American69673
Other Race454519
Asian444439

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

The highest rate of bachelors degrees is among asian people with a rate of 88.64%.

Jefferson County, Kansas Educational Attainment by Race

All

Male

Female

Name
Average
Male
Female
Bachelors Degree$52,917$60,033$44,825
Graduate Degree$67,708$65,000$68,009
High School Graduate$45,263$54,410$31,641
Less Than 9th Grade$34,583$42,083$20,625
Overall$51,643$57,921$42,917
Some College$51,823$62,177$43,286

$51,643

Average Earnings

$57,921

Average Male

$42,917

Average Female

Jefferson County, Kansas Earnings by Educational Attainment

Jefferson County, Kansas Language by Age

Only English

Spanish

Other Indo-European Languages

Asian and Pacific Island Languages

Other Languages

Jefferson County, Kansas Language

98.39% of Jefferson County, Kansas residents speak only English, while 1.61% speak other languages. The non-English language spoken by the largest group is Spanish, which is spoken by 1.22% of the population.

Jefferson County, Kansas Language

Jefferson County, Kansas Poverty by Race

rate

Name
Total
In Poverty
Poverty Rate
White16,7671,0116.03%
Multiple787455.72%
Native942223.4%
Hispanic591223.72%
Black136139.56%

6.04%

Overall Poverty Rate

6.79%

Male Poverty Rate

5.26%

Female Poverty Rate

Poverty in Jefferson County, Kansas

The race most likely to be in poverty in Jefferson County, Kansas is Native, with 23.4% below the poverty level.

The race least likely to be in poverty in Jefferson County, Kansas is Hispanic, with 3.72% below the poverty level.

The poverty rate among those that worked full-time for the past 12 months was 1.05%. Among those working part-time, it was 9.08%, and for those that did not work, the poverty rate was 11.29%.

Jefferson County, Kansas Poverty

rate

Rate
Poverty
Less Than 9th Grade12.37%
High School6.65%
Some College4.75%
Bachelors or Greater1.11%

Jefferson County, Kansas Poverty Rate by Education

rate

Rate
Poverty
Female Unemployed9.56%
Male Unemployed6.93%
Male Employed4.76%
Female Employed1.63%

Jefferson County, Kansas Poverty Rate by Employment Status and Sex

Jefferson County, Kansas Income by Household Type

Households

Families

MarriedFamilies

NonFamilies

Name
Median
Mean
Families$93,142$113,017
Households$74,562$93,904
Married Families$101,867$-999,999,999
Non Families$38,388$49,061

mean

median

Income by Household Type

Jefferson County, Kansas Marital Status

Married

Widowed

Divorced

Separated

NeverMarried

Marriage Rates

57.8%

Overall Marriage Rate

59.5%

Male Marriage Rate

56.0%

Female Marriage Rate

Jefferson County, Kansas Married by Age and Sex

male

female

Jefferson County, Kansas 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, Kansas Marital Status by Race

Married

Widowed

Divorced

Separated

NeverMarried

Jefferson County, Kansas Marital Status

Second Gulf War

First Gulf War

Vietnam

Korea

World War II

1,240

Number of Veterans

1,212

Male Veterans

28

Female Veterans

War
Veterans
Vietnam556
First Gulf War242
Second Gulf War229
Korea26
World War II6

Jefferson County, Kansas Veterans by War

count

Age Group
Veterans
65 to 74401
75+333
35 to 54267
55 to 64173
18 to 3466

Jefferson County, Kansas Veterans by Age

count

Name
Veterans
% of Total
White1,1970.08900289984385457
Black190.19387755102040816
2+ Races190.03525046382189239
Hispanic130.03299492385786802
Other Race50.1111111111111111

Jefferson County, Kansas Veterans by Race

Jefferson County, Kansas Veterans by Education

Less Than 9th Grade

High School Graduate

Some College

Bachelors or Greater

3.46%

Veteran Poverty Rate

34.24%

Veteran Disability Rate

Jefferson County, Kansas Veterans by Education

LaborForceParticipation

64.4%

Labor Force Participation

62.1%

Employment Rate

3.5%

Unemployment Rate

Jefferson County, Kansas Employment by Age

LaborForceParticipation

Jefferson County, Kansas Employment by Race

LaborForceParticipation

Jefferson County, Kansas 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

77.08%

Born in Jefferson County, Kansas

99.11%

Native Born

0.89%

Foreign Born

0.53%

Non Citizen

0.36%

Naturalized

Place of Birth

99.11% of Jefferson County, Kansas residents were born in the United States, with 77.08% having been born in Kansas. 0.53% of residents are not US citizens. Of those not born in the United States, the largest percentage are from Latin America.

Jefferson County, Kansas Place of Birth

Sources