COUNTY
Lewis and Clark County
Montana · 75,331 residents (2025 est.) · 3,458 sq mi
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Part of the Helena metro area
The short version
Lewis and Clark County is home to 73,464 people in Montana. That puts it in the top 6% of US counties for household income. 2% of people here were born outside the United States. The population is up 32% since 2000. There are 21 people per square mile. About 43% of adults have finished a four-year degree.
At a glance
Average income
near the US median
US median: $82,259
Older
median age 41.8
US median: 38.9
More educated
43% hold a bachelor's degree
US average: 36%
Less affordable
home values up 104%, inflation adjusted
US median home: $376,019
Section 01
Population & growth
73,464
+32%since 2000
from 55,716 in 2000
75,331 in 2025 (Census Bureau estimate)
1990 – 2025
Land area
3,458 sq mi
Population, 1990 – 2024
202473K
Age distribution, 2024
Under 55.2%(3,804)
5 to 95.9%(4,349)
10 to 146.2%(4,573)
15 to 196.1%(4,488)
20 to 245.2%(3,843)
25 to 3412%(8,827)
35 to 4413.5%(9,944)
45 to 5411.6%(8,530)
55 to 6414%(10,263)
65 to 7412.8%(9,384)
75 to 845.9%(4,325)
85 and over1.5%(1,134)
BAR + DOT: THIS PLACE · TICK: US AVERAGE
Section 02
Income & economy
$78,237
+15%inflation adjusted, since 2000
from $37,360 in 2000
US average: $82,259
1990 – 2024
Households earning $100K+
52.3%
+24.3 ptssince 2009
from 28.0% in 2009
US average: 53.3%
Workforce by industry, 2024
Information9.7%
Wholesale trade8%
Other services6.2%
Public administration4.7%
Agriculture, forestry, fishing2.9%
Retail trade2.8%
Finance & insurance2.4%
Construction2.3%
Professional, scientific, technical2.2%
Transportation & warehousing1.6%
Arts, entertainment, food1.2%
Manufacturing0.7%
Education & health services0.2%
BAR + DOT: THIS PLACE · TICK: US AVERAGE
Section 03
Housing
$393,500
+104%inflation adjusted, since 2000
from $105,800 in 2000
US average: $376,019
1990 – 2024
5.0
+46%since 2009
from 3.4 in 2009
2009 – 2024
Years of local income it takes to buy a local home, on a scale of about 0 to 15. Lower is more affordable.
75
Our index, 0 to 100. Higher means faster recent growth in incomes, home values, and college degrees.
Section 04
Race & ethnicity
2000
White, non-Hispanic94.4%(52,571)
Black0.2%(104)
Hispanic / Latino1.5%(843)
Asian0.5%(282)
Other0%
2024
White, non-Hispanic88.6%(65,103)
Black0.5%(385)
Hispanic / Latino4%(2,958)
Asian0.5%(359)
Other6.3%(4,659)
26
+61%since 2009
from 16 in 2009
2009 – 2024
Our index, 0 to 100. Higher means a more even mix of racial and ethnic groups.
14
−14%since 2020
from 17 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
Mexican2.4%(1,771)
Puerto Rican0.4%(270)
Spaniard0.2%(135)
South American0.2%(126)
Cuban0.1%(103)
Colombian0.1%(69)
Peruvian0.1%(52)
Central American0%(24)
Guatemalan0%(24)
Ecuadorian0%(5)
Asian origin
Thai0.1%(108)
Filipino0.1%(83)
Asian Indian0.1%(40)
Korean0%(27)
Vietnamese0%(27)
Taiwanese0%(19)
Cambodian0%(18)
Japanese0%(17)
Chinese0%(2)
Pacific Islander origin
Native Hawaiian0%(28)
Ancestry
German23.5%(17,286)
Irish15.9%(11,681)
English15.4%(11,297)
Norwegian6.6%(4,877)
American5.9%(4,302)
Italian3.6%(2,680)
Swedish3.6%(2,646)
French3.1%(2,282)
Scottish3%(2,184)
Polish1.8%(1,328)
Scotch-Irish1.5%(1,069)
Dutch1.4%(995)
+ 34 more ancestry groups with data
Welsh1.1%(780)
Danish1%(730)
Finnish0.9%(687)
British0.7%(546)
Russian0.6%(448)
Ukrainian0.6%(432)
Romanian0.5%(384)
French Canadian0.5%(359)
Austrian0.4%(309)
Czech0.4%(287)
Swiss0.4%(275)
Hungarian0.3%(256)
Greek0.3%(248)
Croatian0.3%(241)
Lithuanian0.2%(176)
Belgian0.2%(151)
Slovak0.2%(144)
West Indian0.2%(114)
Subsaharan African0.1%(106)
Portuguese0.1%(95)
Canadian0.1%(68)
Bulgarian0.1%(49)
Armenian0.1%(40)
Arab0.1%(39)
Serbian0.1%(38)
Slovene0%(36)
Trinidadian & Tobagonian0%(20)
Brazilian0%(16)
Macedonian0%(12)
Nigerian0%(12)
Ethiopian0%(10)
Latvian0%(9)
Australian0%(7)
Lebanese0%(3)
Section 05
Education
High school or higher
94.8%
+3.5 ptssince 2000
from 91.4% in 2000
US average: 89.6%
Section 06
Commute & transportation
Section 07
Work & employment
Women 20-64 in the labor force
79.6%
−0.9 ptssince 2020
from 80.5% in 2020
US average: 74.6%
Section 08
People & community
Computer in household
95.0%
+2.9 ptssince 2020
from 92.1% in 2020
US average: 95.5%
Marital status
Men 15+
Never married30.4%(9,107)
Married53.1%(15,916)
Widowed2.5%(736)
Divorced14%(4,205)
Women 15+
Never married23.4%(7,208)
Married51.9%(15,984)
Widowed8.8%(2,718)
Divorced15.8%(4,864)
SHARE WITHIN EACH SEX · POPULATION 15 AND OVER · 2024
Section 09
Health coverage
Direct-purchase
16.3%
+0.9 ptssince 2020
from 15.4% in 2020
US average: 13.8%
VA health care
5.1%
−1.0 ptssince 2020
from 6.1% in 2020
US average: 2.2%
Any private
72.2%
−0.8 ptssince 2020
from 73.0% in 2020
US average: 67.1%
Any public
39.2%
+1.3 ptssince 2020
from 37.9% in 2020
US average: 36.7%
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, 2024
Gulf War (2001 or later)35.1%(1,960)
Gulf War (1990s)26.2%(1,463)
Vietnam era33.5%(1,870)
Korean War2.7%(151)
World War II0.5%(30)
Share of the 5,583 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.
BAR + DOT: THIS PLACE · TICK: US AVERAGE
Drill deeper
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Compare Lewis and Clark County to nearby counties
LEWIS AND CLARK COUNTY VS
Powell County
Income$66,923−14%
Home value$306,500−22%
Population7,157−90%
SEE FULL COMPARISON →
LEWIS AND CLARK COUNTY VS
Teton County
Income$70,430−10%
Home value$264,000−33%
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LEWIS AND CLARK COUNTY VS
Cascade County
Income$67,690−13%
Home value$265,300−33%
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LEWIS AND CLARK COUNTY VS
Broadwater County
Income$70,374−10%
Home value$426,600+8%
Population8,493−89%
SEE FULL COMPARISON →
Frequently asked
How many people live in Lewis and Clark County, Montana?
Lewis and Clark County, Montana has about 73,464 residents according to the 2024 American Community Survey.
What is the median household income in Lewis and Clark County, Montana?
The typical household in Lewis and Clark County, Montana earns about $78,237 a year. Half of households make more than that, and half make less.
Is Lewis and Clark County, Montana expensive?
In Lewis and Clark County, Montana, the median home is worth about $393,500, and the typical rent is about $1,102 a month.
How educated are people in Lewis and Clark County, Montana?
About 43.0% of adults age 25 and over in Lewis and Clark County, Montana hold a bachelor's degree or higher.
What is the poverty rate in Lewis and Clark County, Montana?
About 8.1% of people in Lewis and Clark County, Montana live below the federal poverty line.
Has Lewis and Clark County, Montana grown since 1990?
Yes, Lewis and Clark County, Montana has grown since 1990. The population has added about 25,969 residents, a change of about 55 percent over that period.
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17 census tracts
Census Tract 12.01Census Tract 4Census Tract 2Census Tract 12.02Census Tract 7.02Census Tract 5.03Census Tract 5.01Census Tract 11.02Census Tract 8Census Tract 9Census Tract 10Census Tract 5.04Census Tract 11.01Census Tract 3Census Tract 6Census Tract 7.01Census Tract 111 ZIP codes
ZIP 59601ZIP 59602ZIP 59635ZIP 59639ZIP 59625ZIP 59410ZIP 59648ZIP 59633ZIP 59640ZIP 59636ZIP 59623Up the hierarchy
All counties in MontanaDATA: US CENSUS BUREAU ACS 5-YEAR + DECENNIAL CENSUS · UPDATED 2024