United States › Idaho › Jefferson County COUNTY · 2020 ACS
Jefferson County Idaho · 30,891 residents · 1,094 sq mi
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The short version
Jefferson County is a county of 30,891 people in Idaho. The population has risen by half since 2000, adding 11,736 people. Owners hold 83% of the housing stock. This skews young, with a median age of 32.1. 4% of people here were born outside the United States. About 25% of adults have finished a four-year degree.
At a glance
Average income
near the US median
US median: $66,278
Younger
median age 32.1
US median: 38.8
Less educated
25% hold a bachelor's degree
US average: 33%
Less affordable
home values up 67%, inflation adjusted
US median home: $265,253
Section 01
Population & growth from 28.8 in 2000
US average: 38.8
Population, 1990 – 2024
15K 20K 25K 30K 35K 1990 2000 2010 2020 2024 Jefferson County Age distribution, 2020
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Section 02
Income & economy $65,577
+16%inflation adjusted, since 2000
from $37,737 in 2000
US average: $66,278
from $13,838 in 2000
US average: $35,364
Households earning $100K+
from 26.3% in 2009
US average: 43.9%
from 10.4% in 2000
US average: 12.8%
Workforce by industry, 2020
Agriculture, forestry, fishing 9.5%
Professional, scientific, technical 4.8%
Public administration 3.9%
Transportation & warehousing 2.5%
Arts, entertainment, food 1.4%
Education & health services 1.1%
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$223,900
+67%inflation adjusted, since 2000
from $89,400 in 2000
US average: $265,253
$853
+31%inflation adjusted, since 2000
from $433 in 2000
US average: $1,124
from 84.9% in 2000
17.3% rent
from 3.10 people in 2009
US average: 2.61
from 2.9 in 2009
Years of local income it takes to buy a local home, on a scale of about 0 to 15. Lower is more affordable.
Section 04
Race & ethnicity 2000
White, non-Hispanic 88.5%(16,955)
Hispanic / Latino 10%(1,907)
2020
White, non-Hispanic 85.6%(26,430)
Hispanic / Latino 10.5%(3,256)
Our index, 0 to 100. Higher means White and non-White residents are more separated across neighborhoods.
Section 04 · Origins
Detailed origins & ancestry Ancestry
+ 16 more ancestry groups with data from 15.2% in 2000
US average: 32.9%
High school or higher
from 84.4% in 2000
US average: 88.5%
from 3.7% in 2000
US average: 12.7%
Section 06
Commute & transportation from 16.7 min in 2000
US average: 26.9
from 74.6% in 2009
US average: 75.1%
from 3.2% in 2009
US average: 8.4%
Section 07
Work & employment from 5.8% in 2011
US average: 5.4%
from 67.4% in 2011
US average: 63.4%
Women 20-64 in the labor force
US average: 73.3%
from 29.1% in 2009
US average: 39.3%
Section 08
People & community from 4.9% in 2009
US average: 13.5%
from 14.7% in 2013
US average: 8.8%
Computer in household
US average: 91.9%
Marital status (2024)
Men 15+
Never married 26.7%(3,343)
Women 15+
Never married 20.7%(2,478)
SHARE WITHIN EACH SEX · POPULATION 15 AND OVER · 2024
Section 09
Health coverage from 14.7% in 2013
US average: 8.8%
Direct-purchase
US average: 13.7%
VA health care
US average: 2.3%
Any private
US average: 68.1%
Any public
US average: 35.2%
Shares are "alone or in combination": a person with both Medicare and Medicaid counts in each, so categories overlap and do not sum to 100%.
Section 09 · Service history
Veterans Veterans by period of service, 2020
Gulf War (2001 or later) 22.8%(281)
Gulf War (1990s) 25.8%(318)
Share of the 1,231 veterans here. A veteran who served across eras counts in each, so shares can total more than 100%. Peacetime-only service is included in the total but not shown as an era.
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Drill deeper
Places similar to Jefferson County Head to head
Compare Jefferson County to nearby counties JEFFERSON COUNTY VS
Madison County
Income $60,160 −8%
Home value $414,800 +85%
Population 55,172 +56%
SEE FULL COMPARISON →
JEFFERSON COUNTY VS
Clark County
Income $55,208 −16%
Home value $216,900 −3%
Population 783 −98%
SEE FULL COMPARISON →
JEFFERSON COUNTY VS
Bingham County
Income $77,878 +19%
Home value $293,300 +31%
Population 51,153 +45%
SEE FULL COMPARISON →
JEFFERSON COUNTY VS
Butte County
Income $53,015 −19%
Home value $217,600 −3%
Population 2,783 −92%
SEE FULL COMPARISON →
Frequently asked
How many people live in Jefferson County, Idaho? Jefferson County, Idaho has about 30,891 residents according to the 2020 American Community Survey.
What is the median household income in Jefferson County, Idaho? The typical household in Jefferson County, Idaho earns about $65,577 a year. Half of households make more than that, and half make less.
Is Jefferson County, Idaho expensive? In Jefferson County, Idaho, the median home is worth about $223,900, and the typical rent is about $853 a month.
How educated are people in Jefferson County, Idaho? About 25.2% of adults age 25 and over in Jefferson County, Idaho hold a bachelor's degree or higher.
What is the poverty rate in Jefferson County, Idaho? About 8.2% of people in Jefferson County, Idaho live below the federal poverty line.
Has Jefferson County, Idaho grown since 1990? Yes, Jefferson County, Idaho has grown since 1990. The population has added about 14,348 residents, a change of about 87 percent over that period.
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