59231 ZIP Code — Saint Marie, MT

Valley County, Montana

ZIP code 59231 is located in Saint Marie, Montana, within Valley County. It covers approximately 0.56 square miles and serves a population of 428 residents. This is a standard ZIP code in the Mountain (MT) timezone, served by area code 406.

About ZIP code 59231

The housing stock consists of a mix of housing types. Most homes were built in the 1960s, giving the area an established character. Median home value is $20,800. Owner-occupancy is high at 83%, well above the national average.

Median household income is $36,509. Poverty affects 38% of residents, above the national average. 71% of households receive Social Security income, suggesting a notable retiree or disability population.

The dominant occupation class is sales and office, with education and healthcare as the leading industry. Remote work is prevalent — 24% of workers work from home.

College attainment at 19% is below the national average, consistent with a trades and production-oriented local economy.

Notable community characteristics include disability rates above the national average at 31%.

Overall, ZIP code 59231 reflects a community defined by a trades-oriented workforce, economic challenges above the national average, high homeownership, a high rate of remote workers, and a significant Social Security-dependent population.

428

population

0.56

sq mi land

Standard

ZIP type

Mountain (MT)

timezone

59231 ZIP code map

Cities in ZIP code 59231

Below are the cities the US Postal Service accepts for ZIP code 59231. Using any city not on this list may result in mail delivery delays.

City	Status
Saint Marie	Acceptable

Demographics updated 06/2026

Population
Total population	428
Population density	764 / sq mi
State FIPS	30
County FIPS	105

Geography
Land area	0.56 sq mi
Water area	0.00 sq mi
Latitude	48.4062
Longitude	-106.4877
Timezone	Mountain (MT)
Area code	406

Total population by age

Gender

Race & ethnicity

Economics updated 06/2026

Household income

Income range	This ZIP	County avg	State avg
Under $50k	56.4%	48.6%	44.2%
$50k – $100k	43.6%	35.5%	32.0%
$100k – $200k	0.0%	13.9%	19.2%
Over $200k	0.0%	2.0%	4.7%

Demographics & statistics

428

Population

764

People per sq mi

37.8

Median age

$36,509

Median household income

$15,911

Per capita income

$20,800

Median home value

Median monthly rent

83.4%

Home ownership

37.6%

Poverty rate

24.1%

Unemployment

868

Housing units

18.9%

Bachelor's or higher

Age distribution

Male Female

5–9

10–14

20–24

25–34

35–44

45–54

55–59

65–74

75–84

85+

← Male

Female →

Age summary

Group	Count	%
Under 18	49	11.4%
18 and over	379	88.6%
65 and over	126	29.4%
Median age	37.8 years

Race & ethnicity

White 58.2%

Two or more races 39.7%

American Indian / Alaska Native 2.1%

Group	Count	%
White	249	58.2%
Two or more races	170	39.7%
American Indian / Alaska Native	9	2.1%

Household income

Income range	This ZIP	County avg	State avg
Under $50k	56.4%	48.6%	44.2%
$50k – $100k	43.6%	35.5%	32.0%
$100k – $200k	0.0%	13.9%	19.2%
Over $200k	0.0%	2.0%	4.7%

Under $10k 13.4%

$10k–$15k 8.9%

$15k–$25k 8.9%

$25k–$35k 7.6%

$35k–$50k 36.9%

$50k–$75k 18.5%

$75k–$100k 5.7%

Range	% of households
Under $10k	13.4%
$10k–$15k	8.9%
$15k–$25k	8.9%
$25k–$35k	7.6%
$35k–$50k	36.9%
$50k–$75k	18.5%
$75k–$100k	5.7%
Median income	$36,509

Housing

Home values

Under $50k 67.2%

$50k–$100k 32.8%

Housing overview

Metric	Value
Median home value	$20,800
Median rent / month	$0
Owner occupied	83.4%
Renter occupied	16.6%
Vacant	82.4%
Single-family detached	6.9%
Large apartment buildings	0.0%
Mobile homes	0.0%
Median rooms	5.7
Avg household size (owned)	2.33

Year built

Era	%
2020 or later	0.0%
2010–2019	0.0%
2000–2009	0.0%
1990–1999	0.0%
1980–1989	0.0%
1970–1979	1.5%
1960–1969	68.6%
1950–1959	30.0%
1940–1949	0.0%
1939 or earlier	0.0%

Bedrooms

Size	% of units
No bedroom (studio)	1.0%
1 bedroom	0.0%
2 bedrooms	13.1%
3 bedrooms	54.5%
4 bedrooms	31.4%
5+ bedrooms	0.0%

Vehicles per household

Vehicles	% of households
No vehicle	11.5%
1 vehicle	41.4%
2 vehicles	33.8%
3 or more	13.4%

Heating fuel

Fuel type	%
Utility gas	86.6%
Electricity	5.7%
Propane / LP gas	7.6%

Households & families

Household type	Count	%
Married-couple family	48	30.6%
Cohabiting couple	3	1.9%
Male householder, no spouse	25	15.9%
Female householder, no spouse	81	51.6%
Households with children under 18	26	16.6%
Households with seniors (65+)	100	63.7%
Average household size	2.73

Marital status

Status	Male	Female
Never married	51.1%	53.3%
Married	38.7%	19.0%
Separated	0.0%	0.0%
Widowed	0.0%	14.0%
Divorced	10.2%	13.6%

Education

Less than 9th grade 6.9%

Some HS, no diploma 24.3%

HS graduate 22.9%

Some college, no degree 24.6%

Associate's degree 2.6%

Bachelor's degree 18.9%

Graduate / professional 0.0%

Metric	%
HS diploma or higher	68.9%
Bachelor's or higher	18.9%

School enrollment (ages 3–17)

Type	Count	%
Nursery / preschool	0	0.0%
Kindergarten	0	0.0%
Elementary school	49	57.6%
High school	0	0.0%
College / grad school	36	42.4%

Employment

Industry of employment

Education & healthcare 47.1%

Retail trade 27.1%

Arts, food & hospitality 22.4%

Public administration 3.5%

Occupation

Category	%
Management, business & arts	27.1%
Service	25.9%
Sales & office	47.1%
Natural resources & construction	0.0%
Production & transportation	0.0%

Employment type

Type	%
Private sector	72.9%
Government	3.5%
Self-employed	23.5%
Unpaid family workers	0.0%

Commute

Method	%
Drive alone	72.2%
Carpool	4.2%
Public transit	0.0%
Walk	0.0%
Work from home	23.6%
Other means	0.0%
Avg commute (minutes)	0.0

Poverty

All people 37.6%

Under 18 years 100.0%

18 and over 29.6%

Married-couple families 54.2%

Female-led households 0.0%

Income support

Source	% of households
Social Security	71.3%
Retirement income	54.8%
Supplemental Security	4.5%
Cash public assistance	0.0%
Food stamps / SNAP	14.6%

Health indicators

Condition	%
Obesity	32.9%
High blood pressure	44.1%
High cholesterol	38.7%
Diabetes	14.9%
Heart disease	11.2%
Stroke	5.1%
Asthma	10.2%
Arthritis	39.0%
Kidney disease	4.5%
Pulmonary disease	10.5%
Cancer	10.6%

Behavior / access	%
Smoking	17.7%
Binge drinking	15.4%
No physical activity	25.0%
Less than 7 hrs sleep	31.6%
Depression	20.6%
Fair or poor health	17.4%
Poor mental health	11.5%
Poor physical health	13.9%
No health insurance	11.6%
Visited doctor (checkup)	77.2%
Visited dentist	60.6%
Cholesterol screening	92.5%
Teeth loss	15.4%

Veterans & disability

Veterans	Count	%
Civilian veterans	12	3.2%

Disability	%
Any disability	30.8%
Under 18	0.0%
18–64 years	33.6%
65 and over	37.3%

Health insurance coverage

Type	%
Private insurance	61.2%
Public insurance	81.1%
No insurance	12.4%
Uninsured under 19	0.0%

Language & origin

Language spoken at home (age 5+)

Language	Count	%
English only	428	100.0%
Spanish	0	0.0%
Other Indo-European	0	0.0%
Asian & Pacific Islander	0	0.0%
Other languages	0	0.0%

Place of birth & citizenship

Origin	Count	%
Native born (US)	428	100.0%
Born in same state	428	100.0%
Born in different state	98	22.9%
Foreign born	0	0.0%
Naturalized citizen	0	0.0%
Not a US citizen	0	0.0%

Ancestry

Ancestry	Count	%
Polish	16	3.7%

Ancestry	Count	%
French	7	1.6%

Technology access

Metric	% of households
Computer access	36.7%
Internet access	82.8%

Source: U.S. Census Bureau, American Community Survey 2025 estimates.

Frequently asked questions about ZIP code 59231

What city is ZIP code 59231 in?

ZIP code 59231 is primarily assigned to Saint Marie, Montana.

What county is ZIP code 59231 in?

ZIP code 59231 falls within Valley County, Montana.

Does ZIP code 59231 have a large retiree population?

71% of households in ZIP code 59231 receive Social Security income, suggesting a significant retiree or disability population.

What is the poverty rate in ZIP code 59231?

38% of residents in ZIP code 59231 live below the poverty line, above the national average.

Does ZIP code 59231 have an older population?

29% of residents in ZIP code 59231 are 65 or older, above the national average of ~17%.

Is ZIP code 59231 mostly owner-occupied?

83% of occupied units in ZIP code 59231 are owner-occupied, well above the national average.

What timezone is ZIP code 59231 in?

ZIP code 59231 observes the MST timezone.