Jefferson County, Idaho Population 2024

35,778

Jefferson County, Idaho's estimated 2024 population is 35,778 with a growth rate of 3.4% in the past year according to the most recent United States census data. Jefferson County, Idaho is the 12th largest county in Idaho. The 2010 population was 26,222 and has seen a growth of 36.44% since that time.

Note: data after 2022 is projected based on recent change

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Year
Population
Growth
Growth Rate
202941,6531,1752.9%
202840,4781,1752.99%
202739,3031,1753.08%
202638,1281,1753.18%
202536,9531,1753.28%
202435,7781,1753.4%
202334,6031,1753.52%
202233,4281,1753.64%
202132,2531,1763.78%
202031,0771,1593.87%
201929,9185001.7%
201829,4189703.41%
201728,4486212.23%
201627,8276942.56%
201527,1331850.69%
201426,9481390.52%
201326,8091670.63%
201226,6423271.24%
201126,315930.35%
201026,222
199016,5431,2398.1%
198015,3043,68531.72%
197011,619-53-0.45%
196011,6721,17711.21%
195010,495-267-2.48%
194010,7621,59117.35%
19309,171-270-2.86%
19209,441-32,212-77.33%
showing: 28 rows
2024 Growth Rate
3.4% (1,175)
County Website
Jefferson County
State
Idaho
County Seat
2010 Population
26,222
Area
1094 mi²
Density
33 people/mi²
Growth Since 2010
36.44% (9,556)
Founded
February 18, 1913

Jefferson County, Idaho Population 2024

Population by Race

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Race
Population
Percentage (of total)
White28,03389.33%
Two or more races1,5394.9%
Other race1,4464.61%
Native American2550.81%
Asian740.24%
Black or African American340.11%
Native Hawaiian or Pacific Islander20.01%
showing: 7 rows

White

Two or more races

Other race

Native American

Asian

Black or African American

Native Hawaiian or Pacific Islander

Jefferson County, Idaho Population by Race

Jefferson County, Idaho Population Pyramid 2024

Jefferson County, Idaho Median Age

31.7

Total

31.6

Male

31.9

Female

Jefferson County, Idaho Adults

There are 20,904 adults, (3,593 of whom are seniors) in Jefferson County, Idaho.

Jefferson County, Idaho Age Dependency

81.3

Age Dependency Ratio

20.8

Old Age Dependency Ratio

60.5

Child Dependency Ratio

Jefferson County, Idaho Sex Ratio

Female15,33248.85%
Male16,05151.15%

Jefferson County, Idaho Population by Age

Jefferson County, Idaho Renter vs Owner Occupied by Household Type

Household Type
Count
Average Size
Owner
Renter
All9,6233.2582.417.6
Married6,8263.8286.913.1
Non Family1,9271.2168.731.3
Female6243.2575.624.4
Male2463.4179.720.3
showing: 5 rows

3.71

Average Family Size

3.25

Average Household Size

82.4%

Rate of Home Ownership

Married

Male

Female

NonFamily

owner

renter

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

Jefferson County, Idaho Educational Attainment by Race

High School Graduation Rate

Bachelors Rate

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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 47.76%.

Jefferson County, Idaho Educational Attainment by Race

All

Male

Female

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$43,246

Average Earnings

$58,924

Average Male

$27,912

Average Female

Jefferson County, Idaho Earnings by Educational Attainment

Jefferson County, Idaho Language by Age

Only English

Spanish

Other Indo-European Languages

Asian and Pacific Island Languages

Other Languages

Jefferson County, Idaho Language

87.81% of Jefferson County, Idaho residents speak only English, while 12.19% speak other languages. The non-English language spoken by the largest group is Spanish, which is spoken by 10.51% of the population.

Jefferson County, Idaho Language

Jefferson County, Idaho Poverty by Race

rate

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Name
Total
In Poverty
Poverty Rate
White26,8931,9077.09%
Hispanic3,36480123.81%
Other1,44248533.63%
Multiple1,521684.47%
Native2552810.98%
showing: 5 rows

8.92%

Overall Poverty Rate

8.31%

Male Poverty Rate

9.56%

Female Poverty Rate

Poverty in Jefferson County, Idaho

The race most likely to be in poverty in Jefferson County, Idaho is Other, with 33.63% below the poverty level.

The race least likely to be in poverty in Jefferson County, Idaho is Multiple, with 4.47% below the poverty level.

The poverty rate among those that worked full-time for the past 12 months was 3.78%. Among those working part-time, it was 8.26%, and for those that did not work, the poverty rate was 13.37%.

Jefferson County, Idaho Poverty

rate

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Rate
Poverty
Less Than 9th Grade17.67%
High School7.82%
Some College6.2%
Bachelors or Greater5.09%
showing: 4 rows

Jefferson County, Idaho Poverty Rate by Education

rate

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Rate
Poverty
Male Unemployed17.72%
Female Unemployed17.35%
Male Employed6.15%
Female Employed2.96%
showing: 4 rows

Jefferson County, Idaho Poverty Rate by Employment Status and Sex

Jefferson County, Idaho Income by Household Type

Households

Families

MarriedFamilies

NonFamilies

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mean

median

Income by Household Type

Jefferson County, Idaho Marital Status

Married

Widowed

Divorced

Separated

NeverMarried

Marriage Rates

62.6%

Overall Marriage Rate

63.3%

Male Marriage Rate

61.9%

Female Marriage Rate

Jefferson County, Idaho Married by Age and Sex

male

female

Jefferson County, Idaho 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 45-54.

Jefferson County, Idaho Marital Status by Race

Married

Widowed

Divorced

Separated

NeverMarried

Jefferson County, Idaho Marital Status

Second Gulf War

First Gulf War

Vietnam

Korea

World War II

1,126

Number of Veterans

980

Male Veterans

146

Female Veterans

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Jefferson County, Idaho Veterans by War

count

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Jefferson County, Idaho Veterans by Age

count

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Jefferson County, Idaho Veterans by Race

Jefferson County, Idaho Veterans by Education

Less Than 9th Grade

High School Graduate

Some College

Bachelors or Greater

4.38%

Veteran Poverty Rate

42.27%

Veteran Disability Rate

Jefferson County, Idaho Veterans by Education

LaborForceParticipation

66.4%

Labor Force Participation

64.8%

Employment Rate

2.4%

Unemployment Rate

Jefferson County, Idaho Employment by Age

LaborForceParticipation

Jefferson County, Idaho Employment by Race

LaborForceParticipation

Jefferson County, Idaho 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

65.84%

Born in Jefferson County, Idaho

95.84%

Native Born

4.16%

Foreign Born

2.41%

Non Citizen

1.75%

Naturalized

Place of Birth

95.84% of Jefferson County, Idaho residents were born in the United States, with 65.84% having been born in Idaho. 2.41% of residents are not US citizens. Of those not born in the United States, the largest percentage are from Latin America.

Jefferson County, Idaho Place of Birth

Sources