Lewis and Clark County, MT demographics:
population, income, and more

Total population
73,464
1.2% year-over-year change
Median household income
$78,237/yr
5.0% year-over-year change
Housing units
34,082
0.7% year-over-year change

Lewis and Clark County population

How many people live in Lewis and Clark County

Lewis and Clark County is home to 73,464 residents, according to the most recent Census data. Gender-wise, 49.6% of Lewis and Clark County locals are male, and 50.4% are female.

Total population
73,464
1.2% year-over-year change
Gender ratio
Male
49.6%
36,462
Female
50.4%
37,002
Value Percent YoY change
Male 36,462 49.6% 1.0%
Female 37,002 50.4% 1.4%
A higher population often means more rental variety and livelier areas. The gender balance—how many men live here compared to women—can reveal a lot about the community and the lifestyles of its residents. Use this info to get a sense of the area's pace and personality.

Age demographics

The median age in Lewis and Clark County is 42, with the population distributed as follows: about 17.3% are children under 15, then 11.3% are in the 15 to 24 age group. Adults between 25 and 44 make up 25.6% of the population, while another 25.6% fall into the 45 to 64 bracket. Finally, around 20.2% are 65 or older.

Median age
41.8
Age breakdown
Under 15
17.3%
15 to 24
11.3%
25 to 44
25.6%
45 to 64
25.6%
Over 65
20.2%
Value Percent YoY change
Under 15 12,726 17.3% -1.4%
15 to 24 8,331 11.3% 2.2%
25 to 44 18,771 25.6% 2.3%
45 to 64 18,793 25.6% 0.4%
Over 65 14,843 20.2% 2.7%
The age composition helps you get insight into who lives in the area. A younger population might mean a more active, fast-paced vibe, while an older one could suggest a quieter, slower lifestyle. If there's a balanced makeup, you’re likely to find a variety of services, housing types, and community spaces that cater to different life stages.

Racial makeup

In Lewis and Clark County, 97.4% of the population are US-born citizens, while 1.9% have gained naturalized citizenship. At the same time, 0.7% of residents are non-citizens. As for race, 90.6% of locals are Caucasian, 0.6% are African American and 0.5% have Asian roots. There’s also a share of 6.1% that includes residents with two or more races.

Citizenship
U.S.-born citizens
97.4%
Non-U.S.-born citizens
1.9%
Non-citizens
0.7%
Value Percent YoY change
U.S.-born citizens 71,580 97.4% 1.3%
Non-U.S.-born citizens 1,379 1.9% -0.4%
Non-citizens 505 0.7% -4.2%
Racial breakdown
White
90.6%
Black or African American
0.6%
American Indian and Alaska Native
1.3%
Asian
0.5%
Native Hawaiian and other Pacific Islander
0%
Two or more races
6.1%
Other
0.9%
Value Percent
White 66,597 90.6%
Black or African American 417 0.6%
American Indian and Alaska Native 965 1.3%
Asian 359 0.5%
Two or more races 4,478 6.1%
Other 648 0.9%

Households in Lewis and Clark County

A peek inside Lewis and Clark County households

Lewis and Clark County has 31,215 households, with an average of 2 members in each. Of these, 59.4% are families, while the remaining 40.6% are made up of individuals living alone or with non-relatives, such as roommates.

Households stats

Total households
31,215
1.8% year-over-year change
Average people per household
2
Non-family households
12,682
Family households
18,533
Value Percent YoY change
Non-family households 12,682 40.6% 1.8%
Family households 18,533 59.4% 1.8%
The mix between family and non-family households gives a glimpse into daily life. A higher percentage of families might mean more parks and schools, while more non-family setups can mean flexible housing and diverse living styles. For renters, this can signal what kinds of homes are common and can help you figure out if the area matches your lifestyle.

Housing in Lewis and Clark County

The housing landscape of Lewis and Clark County

Lewis and Clark County's housing consists of 34,082 units, with 66% being detached single-family homes ideal for those wanting space. Attached options, including duplexes and townhouses, make up 3.8% and offer a more compact, shared living style. Then there are the multifamily buildings in the area, and for those seeking flexibility, non-traditional options like mobile homes account for 9.6% of the housing landscape.

Housing units
34,082
0.7% year-over-year change
Housing types
Value Percent
1 unit, detached 22,491 66%
1 unit, attached 1,300 3.8%
2 units 1,182 3.5%
3 or 4 units 2,828 8.3%
5 to 9 units 978 2.9%
10 to 19 units 643 1.9%
20 to 49 units 750 2.2%
50 or more units 597 1.8%
Mobile home 3,288 9.6%
Boat, RV, van, etc. 25 0.1%
Homes built since 2020
1,092
76.4% year-over-year change

The age of buildings in Lewis and Clark County

In Lewis and Clark County, the median construction year is 1982. About 13.1% of homes were built before the 1940s, with another 3.4% going up by 1949. Most development happened in the second half of the 20th century. Then, 12.9% of homes were added from 2000 to 2009, 13.1% between 2010 and 2019, and 3.2% are part of the newest wave of development.

Construction year breakdown by decade
Value Percent YoY change
Built in 1939 or earlier 4,477 13.1% 4.4%
Built between 1940 and 1949 1,167 3.4% -1.9%
Built between 1950 and 1959 2,096 6.2% -8.0%
Built between 1960 and 1969 2,187 6.4% 0.6%
Built between 1970 and 1979 6,268 18.4% 1.1%
Built between 1980 and 1989 3,773 11.1% -7.3%
Built between 1990 and 1999 4,171 12.2% -4.1%
Built between 2000 and 2009 4,395 12.9% 0.2%
Built between 2010 and 2019 4,456 13.1% 4.1%
Built in 2020 or later 1,092 3.2% 76.4%
As a renter, knowing when homes were built helps you understand the potential condition and design of rental units. Newer builds may have more contemporary layouts, while older homes can offer character or larger lots, depending on the area.

Lewis and Clark County occupancy rates

Out of the 31,215 occupied housing units in Lewis and Clark County, 70.1% are owner-occupied, while 29.9% are lived in by tenants. Meanwhile, 8.4% of all homes on the local market sit vacant.

Occupied housing units
31,215
1.8% year-over-year change
Occupancy breakdown
Renter occupied
9,338
Owner occupied
21,877
Value Percent YoY
change
Renter occupied 9,338 29.9% 0.5%
Owner occupied 21,877 70.1% 2.4%
Unoccupied housing units
8.4%
Unoccupied housing units refer to homes that are currently without residents—whether they're waiting for renters or owners, used seasonally, or simply unclaimed. A higher share of empty homes may mean more housing availability, while a low number can reflect a tighter market with more competition. This, along with the renter-vs.-owner mix, helps paint a clearer picture of what types of housing and services are likely to be available in the area.

Lewis and Clark County housing costs

Housing costs in Lewis and Clark County come to a median of $1,258 per month, while tenants specifically pay a median gross rent of $1,102.

Median housing costs per month
$1,258/month
This figure sums up typical monthly housing costs for all households in the area. If you own, it includes mortgage payments in addition to property taxes, insurance and HOA fees. If you rent, it accounts for rent plus extras like utilities. It’s useful for seeing how local living expenses stack up compared to other places.
Median gross rent in Lewis and Clark County
$1,102/month
Gross rent gives a more complete look at what renters actually pay, including not just base rent, but also utilities and fees. It’s a key number for evaluating rental affordability in your area of interest and understanding how it compares to nearby locations.

Education in Lewis and Clark County

Lewis and Clark County education at a glance

About 28.3% of the population in Lewis and Clark County went to high school, while 20.7% pursued college studies. Another 9.4% earned an associate degree and 27.5% hold a bachelor’s. Meanwhile, 13.2% went even further, earning a master’s or doctorate.

Education level
Value Percent YoY change
No high school 502 0.9% -5.6%
High school diploma 16,407 28.3% -1.6%
College diploma 11,985 20.7% 4.6%
Associate degree 5,458 9.4% 2.4%
Bachelor's degree 15,903 27.5% 3.8%
Graduate degree 7,643 13.2% -0.9%
A community’s education mix can offer insights into the local economy and housing market. Higher levels of education often align with more job opportunities and stable incomes, which can increase demand for homes and influence both rent prices and rental availability.

Income in Lewis and Clark County

How much people earn in Lewis and Clark County

The average annual household income in Lewis and Clark County was $104,055 in 2024, the most recent annual data available, according to the U.S. Census Bureau. This marked a +3.5% change from the previous year. At the same time, the median income stood at $78,237, reflecting a +5% shift over the same period.

Average household income in Lewis and Clark County
$104,055/year
3.5% year-over-year change
Median household income in Lewis and Clark County
$78,237/year
5.0% year-over-year change

Lewis and Clark County income by age

In Lewis and Clark County, households led by residents aged 25 to 44 — usually in the early to mid stages of their careers — have a median income of $95,532. Those with someone between 45 and 64 in charge, often well established professionally, earn $94,981 overall. Younger households, where the main provider is under 25 and just starting out, report a median income of $41,932, while those led by someone over 65, many of whom may be retired, have about $58,352 in earnings. Overall, 91.9% of the locals in this community live above the poverty line.

Income breakdown by age
Value YoY change
Under 25 $41,932 1.2%
25 - 44 $95,532 11.5%
45 - 64 $94,981 4.2%
Over 65 $58,352 2.7%
Above poverty level
65,500
Below poverty level
5,789
Value Percent YoY
change
Above poverty level 65,500 91.9% 2.1%
Below poverty level 5,789 8.1% -6.4%

Employment in Lewis and Clark County

Workforce and job types in Lewis and Clark County

The job market in Lewis and Clark County is powered by 36,577 working residents, spread across a range of industries and roles. 83.3% of the working population are employed in professional or administrative positions, while 16.7% are in hands-on or service-based jobs. Also, 12.1% run their own businesses, 47.6% are employed by private companies, and 27.4% work in the public sector.

Workforce demographics

Working population
36,577
2.4% year-over-year change
White collar
30,475
Blue collar
6,102
Value Percent YoY change
White collar 30,475 83.3% 3.2%
Blue collar 6,102 16.7% -1.3%
Employer type
Self employees
12.1%
Private companies
47.6%
Governmental workers
27.4%
Not for profit companies
12.9%
Value Percent YoY change
Self employees 4,417 12.1% 6.1%
Private companies 17,416 47.6% 1.6%
Governmental workers 10,039 27.4% 3.6%
Not for profit companies 4,705 12.9% -0.5%
Unemployment rate
3.2%
-5.9% year-over-year change

Available workforce

The unemployment rate in Lewis and Clark County stands at 3.2%, representing the share of the workforce currently without a job and actively looking for one.

For renters, the unemployment rate helps paint a picture of job security and financial stability in the area. Rates around 4% to 5% are considered typical. A lower-than-average rate might suggest strong job prospects and a thriving local economy, while a higher rate could hint at fewer opportunities—both useful to consider when planning a move.

Transportation in Lewis and Clark County

How people get around in Lewis and Clark County

In Lewis and Clark County, the average commute time is 18 minutes. Commuting methods vary: 78.9% of residents travel by personal vehicle and 4.3% prefer to walk, while the remaining share relies on public transit or on two wheelers to get from A to B.

Commute time
18 min
4.6% year-over-year change
Means of transportation
Value Percent YoY change
Car 28,944 78.9% 1.5%
Bus or trolleybus 77 0.2% 14.9%
Motorcycle 77 0.2% -38.9%
Bicycle 386 1% 26.6%
Walk 1,579 4.3% -8.5%
Understanding how locals get to work can help you plan your own routine. High car usage might mean you’ll need a vehicle, while strong public transit or walkability could save you the hassle. Commute times also play a big role in quality of life—shorter trips can give you more time for the things you enjoy.

What is the median and average household income in Lewis and Clark County by zipcode?

Zipcode Population Number of households Median income Average income
59601 31,728 14,984 $72,290 $98,929
59602 30,754 11,688 $92,985 $112,682
59633 272 179 $0 $115,138
59635 8,292 3,381 $83,740 $101,421
59636 32 22 $0 $0
59639 1,021 560 $57,778 $78,074
59640 160 58 $99,167 $119,486
59648 486 177 $65,750 $85,711
59410 520 249 $42,321 $68,035

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FAQs about Lewis and Clark County demographics 

What is the total population of Lewis and Clark County?

Lewis and Clark County has a total population of 73,464 residents, according to the latest release from the U.S. Census Bureau: the 2019-2023 American Community Survey (ACS) 5-year estimates. This figure changed by +1.2% compared to a year ago.

What is the gender ratio in Lewis and Clark County?

The gender ratio in Lewis and Clark County is as follows:
  • 49.6% males (36,462 residents)
  • 50.4% females (37,002 residents)

What is the median age in Lewis and Clark County?

The median age in Lewis and Clark County is 41.8.

What is the age distribution of the population in Lewis and Clark County?

The age distribution in Lewis and Clark County is as follows:
  • Under 15: 17.3% (12,726 residents)
  • Ages 15-24: 11.3% (8,331 residents)
  • Ages 25-44: 25.6% (18,771 residents)
  • Ages 45-64: 25.6% (18,793 residents)
  • Over 65: 20.2% (14,843 residents)

What is the racial and ethnic makeup of Lewis and Clark County?

The racial and ethnic makeup of Lewis and Clark County is as follows:
  • White: 90.6% (66,597 residents)
  • Black or African American: 0.6% (417 residents)
  • American Indian and Alaska Native: 1.3% (965 residents)
  • Asian: 0.5% (359 residents)
  • Native Hawaiian and Other Pacific Islander: 0% (0 residents)
  • Two or More Races: 6.1% (4,478 residents)
  • Other: 0.9% (648 residents)

What percentage of the population in Lewis and Clark County are U.S.-born citizens?

U.S.-born citizens represent 97.4% of the population in Lewis and Clark County.

How many housing units are there in Lewis and Clark County?

There are 34,082 housing units in Lewis and Clark County, reflecting a +0.7% change compared to the previous year, according to the latest data from the U.S. Census Bureau.

How many households are in Lewis and Clark County and what is the average household size?

Lewis and Clark County has a total of 31,215 households, with an average of 2 people in each.

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

Lewis and Clark County has a median household income of $78,237, representing a +5.0% shift from the previous year, according to the U.S. Census Bureau.

What is the employment rate and job market overview for Lewis and Clark County?

The employment rate is 96.8% in Lewis and Clark County, with a workforce of 36,577 residents. Here’s a detailed breakdown of the local job market:

Job types:
  • White-collar workers: 83.3% (30,475 residents)
  • Blue-collar workers: 16.7% (6,102 residents)

Places of employment:
  • Self-employed: 12.1% (4,417 residents)
  • Private companies: 47.6% (17,416 residents)
  • Governmental workers: 27.4% (10,039 residents)
  • Not-for-profit companies: 12.9% (4,705 residents)

Data source & methodology

The demographic data on this page was sourced from the latest U.S. Census Bureau release—the 2019–2023 American Community Survey (ACS) 5-year estimates.

The information, issued annually, is compiled and published by the Point2Homes Research Team as soon as new data becomes available.

No representation, guarantee, or warranty is made concerning the accuracy or completeness of modified or aggregated information for particular areas.

Page last updated: September 2025