Jefferson County, Idaho Population 2020

Jefferson County, Idaho's estimated population is 28,500 with a growth rate of 2.37% in the past year according to the most recent United States census data. Jefferson County, Idaho is the 12th largest county in Idaho.

Year Population Growth Growth Rate
201829,4399393.29%
201728,5006592.37%
201627,8417122.62%
201527,1291910.71%
201426,9381410.53%
201326,7971580.59%
201226,6393281.25%
201126,311900.34%
201026,2219,67858.50%
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%

How Many People Live in Jefferson County, Idaho?

28,500

Jefferson County, Idaho Population Growth

Population by Race

Race Population Percentage
White25,75992.10%
Some Other Race1,3074.67%
Two or More Races5652.02%
American Indian and Alaska Native1580.56%
Asian1420.51%
Black or African American240.09%
Native Hawaiian and Other Pacific Islander140.05%

Jefferson County, Idaho Population Pyramid 2020

Jefferson County, Idaho Median Age

31.2


Total

30.9


Male

31.5


Female

Jefferson County, Idaho Adults

There are 18,325 adults, (3,030 of whom are seniors) in Jefferson County, Idaho.

Jefferson County, Idaho Age Dependency

82.9

Age Dependency Ratio

19.8

Old Age Dependency Ratio

63.1

Child Dependency Ratio

Jefferson County, Idaho Sex Ratio

Female

13,674

48.89%

Male

14,295

51.11%

Jefferson County, Idaho Households and Families

Jefferson County, Idaho Renter vs Owner Occupied by Household Type

Jefferson County, Idaho Household Types

Type Owner Renter
Married86.1%13.9%
All79.7%20.3%
Male66.8%33.2%
Non Family64.1%35.9%
Female62.7%37.3%

79.7%

Rate of Home Ownership

Type Count Average Size Owned
All8,6473.2379.7
Married6,1013.6986.1
Non Family1,6441.2164.1
Female5013.9862.7
Male4013.666.8

3.62

Average Family Size

3.23

Average Household Size

4.4%

Unmarried (Opposite Sex)

0%

Unmarried (Same Sex)

Jefferson County, Idaho Education

Education Attained Count Percentage
Less Than 9th Grade7994.99%
9th to 12th Grade9505.93%
High School Graduate4,44027.71%
Some College3,78023.59%
Associates Degree2,44015.23%
Bachelors Degree2,50215.61%
Graduate Degree1,1146.95%

Jefferson County, Idaho Educational Attainment by Race

Name Total High School Bachelors
White14,31813,4193,493
Hispanic1,35251461
Other Race63120411
Asian14214257
Multiple Races11811530
Native American10589
Black1313
Islander99

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

The highest rate of bachelors degrees is among asian people with a rate of 40.14%.

Name Average Male Female
Overall$35,994$45,314$23,290
Less Than High School$31,094$40,000$11,075
High School Grad$30,075$37,404$16,350
Some College$32,667$45,752$24,742
Bachelors Degree$39,382$54,597$33,617
Graduate Degree$61,623$73,661$53,705

$35,994

Average Earnings

$45,314

Average Male

$23,290

Average Female

Jefferson County, Idaho Language

Jefferson County, Idaho Language by Age

Jefferson County, Idaho Language

90.26% of Jefferson County, Idaho residents speak only English, while 9.74% speak other languages. The non-English language spoken by the largest group is Spanish, which is spoken by 8.17% of the population.

Jefferson County, Idaho Poverty

Jefferson County, Idaho Poverty by Race

Name Total In Poverty Poverty Rate
White24,1961,4766.10%
Hispanic2,94157519.55%
Other1,3071168.88%
Asian1424934.51%
Multiple565305.31%
Native1543019.48%

7.73%

Overall Poverty Rate

7.00%

Male Poverty Rate

8.50%

Female Poverty Rate

Poverty in Jefferson County, Idaho

The race most likely to be in poverty in Jefferson County, Idaho is Asian, with 34.51% below the poverty level.

The race least likely to be in poverty in Jefferson County, Idaho is Multiple, with 5.31% below the poverty level.

The poverty rate among those that worked full-time for the past 12 months was 3.41%. Among those working part-time, it was 6.66%, and for those that did not work, the poverty rate was 12.05%.

Name Poverty
Less Than High School11.61%
High School9.00%
Some College4.75%
Bachelors or Greater4.07%

Jefferson County, Idaho Income

Jefferson County, Idaho Income by Household Type

Name Median Mean
Households$60,162$72,995
Families$64,292$78,134
Married Families$66,612-
Non Families$35,260$45,894

Jefferson County, Idaho Marital Status

Jefferson County, Idaho Marital Status

Marriage Rates

63.5%

Overall Marriage Rate

61.6%

Male Marriage Rate

65.5%

Female Marriage Rate

Jefferson County, Idaho Married by Age and Sex

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

Jefferson County, Idaho Veterans

1,462

Number of Veterans

1,390

Male Veterans

72

Female Veterans

War Veterans
Vietnam574
Second Gulf War383
First Gulf War278
Korea107
World War II14
Name Veterans % of Total
White1,3748.11%
Hispanic985.77%
Other829.30%
Hawaiian428.57%
Indian21.71%

$Jefferson County, Idaho Veterans by Education

4.58%

Veteran Poverty Rate

30.03%

Veteran Disability Rate

Jefferson County, Idaho Employment Status

67%

Labor Force Participation

63.9%

Employment Rate

4.6%

Unemployment Rate

Jefferson County, Idaho Place of Birth

Origin of Non-Citizens

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

Origin of Naturalized Citizens

65.04%

Born in Idaho

96.08%

Native Born

3.92%

Foreign Born

2.88%

Non Citizen

Place of Birth

96.08% of Jefferson County, Idaho residents were born in the United States, with 65.04% having been born in Idaho. 2.88% of residents are not US citizens. Of those not born in the United States, the largest percentage are from Latin America.

  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