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COUNTY · 2000 CENSUS

Lewis and Clark County

Montana · 55,716 residents · 3,458 sq mi
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Part of the Helena metro area
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The short version

Lewis and Clark County is home to 55,716 people in Montana. About 32% of adults have finished a four-year degree. Getting to work takes 11 minutes on average. The population is up 17% since 1990. Median household income is $37,360, under the $42,589 national median. The typical home is worth $105,800, having risen by half since 1990.

At a glance
Lower income
below the US median
US median: $42,589
Older
median age 38.0
US median: 35.2
More educated
32% hold a bachelor's degree
US average: 24%
Less affordable
home values up 30%, inflation adjusted
US median home: $120,530
Section 01

Population & growth

55,716
+17%since 1990
from 47,495 in 1990
1990 – 2025
38.0
+12%since 1990
from 34.0 in 1990
US average: 35.2
Land area
3,458 sq mi
Population, 19902024
45K53K60K68K76K19902000201020202024Lewis and Clark County
202473K
1990201020202024
Age distribution, 2000
Under 56.2%(3,435)
US avg: 6.8%
5 to 97%(3,873)
US avg: 7.3%
10 to 147.6%(4,233)
US avg: 7.3%
15 to 197.7%(4,299)
US avg: 7.2%
20 to 245.7%(3,161)
US avg: 6.7%
25 to 3411.2%(6,265)
US avg: 14.2%
35 to 4416.7%(9,294)
US avg: 16%
45 to 5416.8%(9,337)
US avg: 13.4%
55 to 649.5%(5,286)
US avg: 8.6%
65 to 746.2%(3,431)
US avg: 6.5%
75 to 844.2%(2,327)
US avg: 4.4%
85 and over1.4%(775)
US avg: 1.5%
BAR + DOT: THIS PLACE · TICK: US AVERAGE
Section 02

Income & economy

$37,360
+7%inflation adjusted, since 1990
from $26,409 in 1990
US average: $42,589
1990 – 2024
$18,763
+52%since 1990
from $12,342 in 1990
US average: $21,522
10.9%
−0.9 ptssince 1990
from 11.8% in 1990
US average: 12.4%
Section 03

Housing

$105,800
+30%inflation adjusted, since 1990
from $61,900 in 1990
US average: $120,530
1990 – 2024
$457
+5%inflation adjusted, since 1990
from $329 in 1990
US average: $602
70.1%
+1.6 ptssince 1990
from 68.5% in 1990
29.9% rent
Section 04

Race & ethnicity

1990
White, non-Hispanic96.7%(45,912)
Black0.1%(49)
Hispanic / Latino1.1%(525)
Asian0.7%(331)
2000
White, non-Hispanic94.4%(52,571)
Black0.2%(104)
Hispanic / Latino1.5%(843)
Asian0.5%(282)

No data for the years selected.

Section 04 · Origins

Detailed origins & ancestry

Detailed origin tables are available for 2024; showing 2024 data.

Hispanic origin
Mexican2.4%(1,771)
Puerto Rican0.4%(270)
Spaniard0.2%(135)
Cuban0.1%(103)
Colombian0.1%(69)
Peruvian0.1%(52)
Asian origin
Thai0.1%(108)
Filipino0.1%(83)
Asian Indian0.1%(40)
Korean0%(27)
Taiwanese0%(19)
Cambodian0%(18)
Japanese0%(17)
Chinese0%(2)
Pacific Islander origin
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)
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)
Portuguese0.1%(95)
Canadian0.1%(68)
Bulgarian0.1%(49)
Armenian0.1%(40)
Arab0.1%(39)
Serbian0.1%(38)
Slovene0%(36)
Brazilian0%(16)
Nigerian0%(12)
Ethiopian0%(10)
Latvian0%(9)
Section 05

Education

31.6%
+3.7 ptssince 1990
from 27.8% in 1990
US average: 24.4%
High school or higher
91.4%
+3.9 ptssince 1990
from 87.4% in 1990
US average: 80.3%
10.3%
+1.4 ptssince 1990
from 9.0% in 1990
US average: 8.8%
Section 06

Commute & transportation

11.0 min
−30%since 1990
from 15.7 min in 1990
US average: 17.6
Section 07

Work & employment

No data for the years selected.

Section 08

People & community

No data for the years selected.

Marital status
Men 15+
Never married24.9%(5,371)
Married60.9%(13,120)
Widowed1.8%(388)
Divorced12.4%(2,668)
Women 15+
Never married19.6%(4,441)
Married57.6%(13,055)
Widowed8.6%(1,947)
Divorced14.3%(3,236)
SHARE WITHIN EACH SEX · POPULATION 15 AND OVER · 2000
Section 09

Health coverage

Showing 2024 (the nearest year with coverage data).

5.7%
−4.8 ptssince 2013
from 10.5% in 2013
US average: 8.4%
56.2%
−1.6 ptssince 2020
from 57.8% in 2020
US average: 54.8%
Direct-purchase
16.3%
+0.9 ptssince 2020
from 15.4% in 2020
US average: 13.8%
21.2%
+0.8 ptssince 2020
from 20.4% in 2020
US average: 18.4%
18.6%
+0.2 ptssince 2020
from 18.4% in 2020
US average: 20.9%
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)
US avg: 26.4%
Gulf War (1990s)26.2%(1,463)
US avg: 24.3%
Vietnam era33.5%(1,870)
US avg: 33.1%
Korean War2.7%(151)
US avg: 4.5%
World War II0.5%(30)
US avg: 1%

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
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Frequently asked

How many people live in Lewis and Clark County, Montana?

Lewis and Clark County, Montana has about 55,716 residents according to the 2000 Census.

What is the median household income in Lewis and Clark County, Montana?

The typical household in Lewis and Clark County, Montana earns about $37,360 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 $105,800, and the typical rent is about $457 a month.

How educated are people in Lewis and Clark County, Montana?

About 31.6% 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 10.9% 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 8,221 residents, a change of about 17 percent over that period.

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DATA: US CENSUS BUREAU ACS 5-YEAR + DECENNIAL CENSUS · UPDATED 2024

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