Jefferson County, Idaho Population 2021

Jefferson County, Idaho's estimated population is 30,803 with a growth rate of 1.54% in the past year according to the most recent United States census data. Jefferson County, Idaho is the 13th largest county in Idaho. The 2010 Population was 26,223 and has seen a growth of 17.47% since this time.

Note: 2020 and 2021 data is projected
Year Population Growth Growth Rate
202130,8034661.54%
202030,3374661.56%
201929,8714661.58%
201829,4059663.40%
201728,4396092.19%
201627,8307032.59%
201527,1271830.68%
201426,9441400.52%
201326,8041630.61%
201226,6413281.25%
201126,313900.34%
201026,2239,68058.51%
199016,5431,2398.10%
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%
19209,4410.00%
2021 Growth Rate
1.54%
County Website
State
Founded
February 18, 1913
County Seat
2010 Population
26,223
Growth Since 2010
17.47%
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Jefferson County, Idaho Population Growth

Population by Race

Race Population Percentage
White26,03991.26%
Some Other Race1,5325.37%
Two or More Races4721.65%
American Indian and Alaska Native3501.23%
Asian1270.45%
Native Hawaiian and Other Pacific Islander140.05%
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Jefferson County, Idaho Population by Race

Jefferson County, Idaho Population Pyramid $2021

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Jefferson County, Idaho Median Age

31.5


Total

31.4


Male

31.5


Female

Jefferson County, Idaho Adults

There are 18,897 adults, (3,127 of whom are seniors) in Jefferson County, Idaho.

Jefferson County, Idaho Age Dependency

80.9

Age Dependency Ratio

19.8

Old Age Dependency Ratio

61.1

Child Dependency Ratio

Jefferson County, Idaho Sex Ratio

Female

14,008

49.09%

Male

14,526

50.91%

Jefferson County, Idaho Population by Age

Jefferson County, Idaho Renter vs Owner Occupied by Household Type

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Jefferson County, Idaho Household Types

Type Owner Renter
Married85.8%14.2%
All80.7%19.3%
Male72.5%27.5%
Female69.6%30.4%
Non Family66.4%33.6%

80.7%

Rate of Home Ownership

Jefferson County, Idaho Households and Families

Type Count Average Size Owned
All8,7913.2480.7
Married6,2993.7285.8
Non Family1,7651.2866.4
Female4543.7369.6
Male2734.0172.5

3.67

Average Family Size

3.24

Average Household Size

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Jefferson County, Idaho Households by Type

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Education Attained Count Percentage
Less Than 9th Grade7644.65%
9th to 12th Grade8555.20%
High School Graduate4,19125.49%
Some College3,88423.62%
Associates Degree2,69016.36%
Bachelors Degree2,91917.75%
Graduate Degree1,1416.94%
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Jefferson County, Idaho Educational Attainment by Sex (over 25)

Jefferson County, Idaho Educational Attainment by Race

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Race Total High School Bachelors
White14,62513,7543,821
Hispanic1,38665273
Other Race7242594
Native American19617895
Asian12712754
2+ Races12212233
Islander88

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

The highest rate of bachelors degrees is among native american people with a rate of 48.47%.

Jefferson County, Idaho Educational Attainment by Race

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Name Average Male Female
Overall$37,517$48,324$24,837
Less Than 9th Grade$31,488$43,252$12,662
High School Graduate$30,362$38,015$21,169
Some College$37,679$50,958$23,372
Bachelors Degree$40,698$58,250$32,350
Graduate Degree$64,583$87,560$58,000

$37,517

Average Earnings

$48,324

Average Male

$24,837

Average Female

Jefferson County, Idaho Earnings by Educational Attainment

Jefferson County, Idaho Language by Age

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Jefferson County, Idaho Language

90.81% of Jefferson County, Idaho residents speak only English, while 9.19% speak other languages. The non-English language spoken by the largest group is Spanish, which is spoken by 7.68% of the population.

Jefferson County, Idaho Language

Jefferson County, Idaho Poverty by Race

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Name Total In Poverty Poverty Rate
White24,7151,1704.73%
Hispanic3,00067122.37%
Other1,52831720.75%
Asian1274737.01%
Native3503710.57%
Multiple472326.78%

6.85%

Overall Poverty Rate

6.73%

Male Poverty Rate

6.99%

Female Poverty Rate

Poverty in Jefferson County, Idaho

The race most likely to be in poverty in Jefferson County, Idaho is Asian, with 37.01% below the poverty level.

The race least likely to be in poverty in Jefferson County, Idaho is White, with 4.73% below the poverty level.

The poverty rate among those that worked full-time for the past 12 months was 3.52%. Among those working part-time, it was 6.09%, and for those that did not work, the poverty rate was 10.49%.

Jefferson County, Idaho Poverty

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Name Poverty
Less Than 9th Grade11.67%
High School7.91%
Some College5.19%
Bachelors or Greater2.76%

Jefferson County, Idaho Poverty Rate by Education

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Rate Poverty
Female Unemployed14.98%
Female Employed5.20%
Male Employed4.23%
Male Unemployed2.05%

Jefferson County, Idaho Poverty Rate by Employment Status and Sex

Jefferson County, Idaho Income by Household Type

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Name Median Mean
Households$63,048$78,637
Families$69,090$83,969
Married Families$71,216-
Non Families$41,021$52,108
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Income by Household Type

Jefferson County, Idaho Marital Status

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Marriage Rates

63.6%

Overall Marriage Rate

61.4%

Male Marriage Rate

65.9%

Female Marriage Rate

Jefferson County, Idaho Married by Age and Sex

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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 35-44.

Jefferson County, Idaho Marital Status by Race

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Jefferson County, Idaho Marital Status

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1,443

Number of Veterans

1,355

Male Veterans

88

Female Veterans

War Veterans
Vietnam585
Second Gulf War404
First Gulf War319
Korea62
World War II16

Jefferson County, Idaho Veterans by War

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Age Group Veterans
65 to 74506
18 to 34257
55 to 64249
35 to 54237
75+194

Jefferson County, Idaho Veterans by Age

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Name Veterans % of Total
White1,2947.49%
Hispanic19210.90%
Other Race13012.96%
Native American154.69%
Islander428.57%

Jefferson County, Idaho Veterans by Race

Jefferson County, Idaho Veterans by Education

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4.30%

Veteran Poverty Rate

28.76%

Veteran Disability Rate

Jefferson County, Idaho Veterans by Education

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67.3%

Labor Force Participation

64.3%

Employment Rate

4.5%

Unemployment Rate

Jefferson County, Idaho Employment by Age

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Jefferson County, Idaho Employment by Race

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Jefferson County, Idaho 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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64.32%

Born in Jefferson County, Idaho

96.25%

Native Born

3.75%

Foreign Born

3.00%

Non Citizen

0.75%

Naturalized

Place of Birth

96.25% of Jefferson County, Idaho residents were born in the United States, with 64.32% having been born in Idaho. 3.00% 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

  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