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COUNTY

Jefferson County

Idaho · 35,297 residents (2025 est.) · 1,093.681 sq mi
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Notable rankings
#102Fastest growingof 3,135+14.3%#140Youngest by median ageof 3,14432.8
The short version

Jefferson County has roughly average household income, with a median household income of $86,679. The county has grown rapidly, with population up 73% since 2000. Median home value has more than tripled since 2000, reaching $408,400. At a median age of 32.8, residents skew younger than the country as a whole. It ranks in the top 5% of US counties for household income.

At a glance
Wealthier
above the US median
US median: $82,259
Younger
median age 32.8
US median: 38.9
Less educated
27% hold a bachelor's degree
US average: 36%
Less affordable
home values up 151%, inflation adjusted
US median home: $376,019
Section 01

Population & growth

Total population
33,154
+73%since 2000
from 19,155 in 2000
1990 – 2025
Population density
30 / sq mi
+45%since 2009
from 21 / sq mi in 2009
US average: 281
Median age
32.8
+14%since 2000
from 28.8 in 2000
US average: 38.9

PEP 2025 EST:35,297 residents (Census Bureau Vintage 2025, released March 2026)

Population, 1990 – 2024
15K20K25K30K35K1990201020202024Jefferson County
202433K
1990201020202024
Age distribution, 2024
Under 57.1%(2,369)
US avg: 5.6%
5 to 99.4%(3,122)
US avg: 6%
10 to 149.5%(3,162)
US avg: 6.4%
15 to 198.8%(2,931)
US avg: 6.6%
20 to 246.1%(2,032)
US avg: 6.5%
25 to 3411.3%(3,736)
US avg: 13.7%
35 to 4414.3%(4,752)
US avg: 13.2%
45 to 5411%(3,657)
US avg: 12.2%
55 to 6410.4%(3,439)
US avg: 12.7%
65 to 747.7%(2,540)
US avg: 10.2%
75 to 843.2%(1,060)
US avg: 5.1%
85 and over1.1%(354)
US avg: 1.9%
BAR + DOT: THIS PLACE · TICK: US AVERAGE
Section 02

Income & economy

Median household income
$86,679
+26%inflation adjusted, since 2000
from $37,737 in 2000
US average: $82,259
1990 – 2024
Per capita income
$31,834
+130%since 2000
from $13,838 in 2000
US average: $44,673
Households earning $100K+
58.8%
+32.6 ptssince 2009
from 26.3% in 2009
US average: 53.3%
Poverty rate
9.7%
−0.7 ptssince 2000
from 10.4% in 2000
US average: 12.5%
Income inequality (Gini)
0.375
+2%since 2010
from 0.367 in 2010
US average: 0.476
Workforce by industry, 2024
Wholesale trade11.5%
US avg: 6.9%
Information10.6%
US avg: 10.8%
Retail trade9.1%
US avg: 9.9%
Finance & insurance5.9%
US avg: 5.9%
Agriculture, forestry, fishing5.5%
US avg: 1.6%
Construction5.5%
US avg: 1.2%
Professional, scientific, technical3.9%
US avg: 5.1%
Other services3.9%
US avg: 6.7%
Transportation & warehousing3.4%
US avg: 2.2%
Public administration2.3%
US avg: 4.8%
Education & health services2%
US avg: 0.9%
Arts, entertainment, food0.4%
US avg: 1.9%
Manufacturing0%
US avg: 0.4%
BAR + DOT: THIS PLACE · TICK: US AVERAGE
Section 03

Housing

Median home value
$408,400
+151%inflation adjusted, since 2000
from $89,400 in 2000
US average: $376,019
1990 – 2024
Median gross rent
$1,138
+44%inflation adjusted, since 2000
from $433 in 2000
US average: $1,442
Owner-occupied
83.0%
−1.8 ptssince 2000
from 84.9% in 2000
17.0% rent
Vacancy rate
5.4%
−1.0 ptssince 2009
from 6.4% in 2009
US average: 10.0%
Owner cost-burdened
21.9%
−2.3 ptssince 2009
from 24.2% in 2009
US average: 22.9%
Renter cost-burdened
22.4%
−1.6 ptssince 2009
from 24.0% in 2009
US average: 47.4%
Afford Score
4.7
+63%since 2009
from 2.9 in 2009
2009 – 2024
Our index: median home value divided by median household income. Lower is more affordable.
Gentrification Score
90
Our index, 0 to 100. Higher means faster recent growth in incomes, home values, and college degrees.
RELATED:See current rent listings in Jefferson County on RentDataNow
Section 04

Race & ethnicity

2000
White, non-Hispanic88.5%(16,955)
Black0.1%(21)
Hispanic / Latino10%(1,907)
Asian0.2%(43)
Other0%
2024
White, non-Hispanic85.7%(28,414)
Black0%(16)
Hispanic / Latino11%(3,638)
Asian0.1%(42)
Other3.1%(1,044)
Diversity Score
32
+15%since 2009
from 27 in 2009
2009 – 2024
Our index, 0 to 100. Higher means a more even mix of racial and ethnic groups.
Segregation Score
16
−27%since 2020
from 22 in 2020
Our index, 0 to 100. Higher means White and non-White residents are more separated across neighborhoods.
Section 04 · Origins

Detailed origins & ancestry

Hispanic origin
Mexican8.6%(2,840)
Chilean0.4%(122)
Venezuelan0.3%(93)
Guatemalan0.2%(82)
Ecuadorian0.2%(82)
Puerto Rican0.2%(76)
Spaniard0.2%(75)
Peruvian0.1%(30)
Cuban0%(1)
Asian origin
Korean0.1%(28)
Chinese0%(4)
Pacific Islander origin
Chamorro0.1%(24)
Samoan0%(6)
Tongan0%(4)
Ancestry
English32.7%(10,838)
German12.7%(4,213)
American5.5%(1,832)
Irish5%(1,668)
Scottish5%(1,653)
French2.5%(817)
Italian2.3%(766)
Norwegian2.3%(757)
Swiss2.2%(719)
Dutch2.1%(687)
Swedish2%(665)
Danish2%(654)
+ 19 more ancestry groups with data
Welsh1.8%(601)
Polish0.6%(196)
Hungarian0.5%(173)
British0.4%(128)
Russian0.2%(66)
Greek0.2%(61)
Austrian0.1%(39)
Canadian0.1%(31)
Finnish0.1%(23)
Portuguese0.1%(22)
Czech0.1%(18)
Belgian0%(11)
Slovak0%(10)
Arab0%(9)
RANKED:Largest English population · Largest German population · Largest Mexican population · Largest American population · Largest Irish population
Section 05

Education

Bachelor's degree or higher
27.4%
+12.1 ptssince 2000
from 15.2% in 2000
US average: 35.6%
High school or higher
93.3%
+8.9 ptssince 2000
from 84.4% in 2000
US average: 89.6%
Graduate degree
8.4%
+4.7 ptssince 2000
from 3.7% in 2000
US average: 14.0%
Section 06

Commute & transportation

Average commute
25.1 min
+51%since 2000
from 16.7 min in 2000
US average: 26.5
Drive alone to work
78.4%
+3.8 ptssince 2009
from 74.6% in 2009
US average: 68.9%
Carpooled to work
9.7%
−3.8 ptssince 2009
from 13.5% in 2009
US average: 8.5%
Public transit
2.2%
−0.9 ptssince 2009
from 3.0% in 2009
US average: 3.2%
Worked from home
7.6%
+2.8 ptssince 2009
from 4.8% in 2009
US average: 15.0%
Walked to work
1.4%
−1.5 ptssince 2009
from 2.9% in 2009
US average: 2.4%
Biked to work
0.0%
−0.2 ptssince 2009
from 0.2% in 2009
US average: 0.4%
No vehicle available
1.3%
−1.8 ptssince 2009
from 3.2% in 2009
US average: 8.3%
Section 07

Work & employment

Unemployment rate
2.7%
−3.2 ptssince 2011
from 5.8% in 2011
US average: 5.2%
Labor force participation
66.1%
−1.3 ptssince 2011
from 67.4% in 2011
US average: 63.5%
Self-employed
15.6%
+3.6 ptssince 2009
from 12.0% in 2009
US average: 13.1%
Management & professional
37.9%
−20.1 ptssince 2009
from 58.0% in 2009
US average: 42.5%
Section 08

People & community

Male
51.2%
+0.5 ptssince 2009
from 50.6% in 2009
Female
48.8%
−0.5 ptssince 2009
from 49.4% in 2009
Foreign born
4.2%
−0.8 ptssince 2009
from 4.9% in 2009
US average: 14.1%
Veterans
5.2%
−44.9 ptssince 2009
from 50.1% in 2009
US average: 6.2%
With a disability
12.8%
+1.5 ptssince 2012
from 11.3% in 2012
US average: 13.3%
Uninsured
7.8%
−77.5 ptssince 2013
from 85.3% in 2013
US average: 8.4%
Broadband at home
95.0%
+16.2 ptssince 2017
from 78.8% in 2017
US average: 91.0%
English only at home
88.4%
−2.2 ptssince 2016
from 90.6% in 2016
US average: 77.7%
Spanish at home
10.0%
+1.8 ptssince 2016
from 8.2% in 2016
US average: 13.6%
Marital status
Men 15+
Never married26.7%(3,343)
Married64.6%(8,102)
Widowed1.1%(141)
Divorced7.6%(958)
Women 15+
Never married20.7%(2,478)
Married63.4%(7,575)
Widowed6%(717)
Divorced9.9%(1,187)
SHARE WITHIN EACH SEX · POPULATION 15 AND OVER · 2024
Drill deeper

Places similar to Jefferson County

Clinton County
Pop 37,128
Lee County
Pop 34,179
Dawson County
Pop 35,365
Effingham County
Pop 34,519
Places similar to Jefferson County
Head to head

Compare Jefferson County to nearby counties

JEFFERSON COUNTY VS
Madison County
Income$60,160−31%
Home value$414,800+2%
Population55,172+56%
SEE FULL COMPARISON →
JEFFERSON COUNTY VS
Clark County
Income$55,208−36%
Home value$216,900−47%
Population783−98%
SEE FULL COMPARISON →
JEFFERSON COUNTY VS
Bingham County
Income$77,878−10%
Home value$293,300−28%
Population51,153+45%
SEE FULL COMPARISON →
JEFFERSON COUNTY VS
Butte County
Income$53,015−39%
Home value$217,600−47%
Population2,783−92%
SEE FULL COMPARISON →
Frequently asked

How many people live in Jefferson County, Idaho?

Jefferson County, Idaho has about 33,154 residents according to the 2024 American Community Survey.

What is the median household income in Jefferson County, Idaho?

The typical household in Jefferson County, Idaho earns about $86,679 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 $408,400, and the typical rent is about $1,138 a month.

How educated are people in Jefferson County, Idaho?

About 27.4% 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 9.7% 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 16,611 residents, a change of about 100 percent over that period.

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Explore from here

6 census tracts
Census Tract 9604.02Census Tract 9604.01Census Tract 9603.02Census Tract 9602Census Tract 9601Census Tract 9603.01
7 ZIP codes
ZIP 83442ZIP 83434ZIP 83444ZIP 83450ZIP 83431ZIP 83425ZIP 83435
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DATA: US CENSUS BUREAU ACS 5-YEAR + DECENNIAL CENSUS · UPDATED 2024

How we source and harmonize this data →