58631 ZIP Code — Glen Ullin, ND

Morton County, North Dakota

ZIP code 58631 is located in Glen Ullin, North Dakota, within Morton County. It covers approximately 370.34 square miles and serves a population of 989 residents. This is a standard ZIP code in the Central (CT) timezone, served by area code 701.

About ZIP code 58631

The housing stock consists of predominantly single-family detached homes. Most homes were built in the pre-1940, giving the area an established character. Median home value is $110,800. Owner-occupancy is high at 79%, well above the national average.

Median household income is $52,500. 45% of households receive Social Security income, suggesting a notable retiree or disability population.

The dominant occupation class is management, business, and professional, with agriculture and mining as the leading industry. The average commute of 30 minutes is near the national average. Remote work is prevalent — 23% of workers work from home.

College attainment at 20% is below the national average, consistent with a trades and production-oriented local economy.

15% of residents lack health insurance, above the national average.

Overall, ZIP code 58631 reflects a community defined by a trades-oriented workforce, high homeownership, a high rate of remote workers, and a significant Social Security-dependent population.

989

population

370.34

sq mi land

Standard

ZIP type

Central (CT)

timezone

58631 ZIP code map

Cities in ZIP code 58631

Below are the cities the US Postal Service accepts for ZIP code 58631. Using any city not on this list may result in mail delivery delays.

City	Status
Glen Ullin	Acceptable
Glen Ullin	Preferred

Nearby ZIP codes

58638 Hebron (8.9 mi) 58520 Almont (17.7 mi)

Demographics updated 05/2026

Population
Total population	989
Population density	3 / sq mi
State FIPS	38
County FIPS	059

Geography
Land area	370.34 sq mi
Water area	2.71 sq mi
Latitude	46.8203
Longitude	-101.8442
Timezone	Central (CT)
Area code	701

Total population by age

Gender

Race & ethnicity

Economics updated 05/2026

Household income

Income range	This ZIP	County avg	State avg
Under $50k	54.0%	34.2%	37.8%
$50k – $100k	30.5%	32.4%	32.8%
$100k – $200k	12.6%	28.6%	23.3%
Over $200k	2.9%	4.9%	6.0%

Demographics & statistics

989

Population

People per sq mi

49.4

Median age

$52,500

Median household income

$31,050

Per capita income

$110,800

Median home value

$785

Median monthly rent

79.4%

Home ownership

15.0%

Poverty rate

4.5%

Unemployment

637

Housing units

19.9%

Bachelor's or higher

Age distribution

Male Female

Under 5

5–9

10–14

15–19

20–24

25–34

35–44

45–54

55–59

60–64

65–74

75–84

85+

← Male

Female →

Age summary

Group	Count	%
Under 18	181	18.3%
18 and over	808	81.7%
65 and over	303	30.6%
Median age	49.4 years

Race & ethnicity

White 87.1%

Two or more races 5%

Hispanic or Latino 3.4%

Native Hawaiian / Pacific Islander 2.2%

Other race 1.4%

American Indian / Alaska Native 0.9%

Group	Count	%
White	892	87.1%
Two or more races	51	5%
Hispanic or Latino	35	3.4%
Native Hawaiian / Pacific Islander	23	2.2%
Other race	14	1.4%
American Indian / Alaska Native	9	0.9%

Household income

Income range	This ZIP	County avg	State avg
Under $50k	54.0%	34.2%	37.8%
$50k – $100k	30.5%	32.4%	32.8%
$100k – $200k	12.6%	28.6%	23.3%
Over $200k	2.9%	4.9%	6.0%

Under $10k 3.9%

$10k–$15k 6.1%

$15k–$25k 7.0%

$25k–$35k 21.9%

$35k–$50k 9.4%

$50k–$75k 21.1%

$75k–$100k 8.6%

$100k–$150k 14.0%

$150k–$200k 5.9%

$200k+ 2.0%

Range	% of households
Under $10k	3.9%
$10k–$15k	6.1%
$15k–$25k	7.0%
$25k–$35k	21.9%
$35k–$50k	9.4%
$50k–$75k	21.1%
$75k–$100k	8.6%
$100k–$150k	14.0%
$150k–$200k	5.9%
$200k+	2.0%
Median income	$52,500

Housing

Home values

Under $50k 16.0%

$50k–$100k 30.4%

$100k–$150k 14.4%

$150k–$200k 14.9%

$200k–$300k 14.1%

$300k–$500k 6.6%

$500k–$1M 3.6%

Housing overview

Metric	Value
Median home value	$110,800
Median rent / month	$785
Owner occupied	79.4%
Renter occupied	20.6%
Vacant	37.6%
Single-family detached	77.2%
Large apartment buildings	0.8%
Mobile homes	15.5%
Median rooms	6.5
Avg household size (owned)	2.01

Year built

Era	%
2020 or later	0.3%
2010–2019	4.7%
2000–2009	3.0%
1990–1999	5.1%
1980–1989	9.0%
1970–1979	15.3%
1960–1969	19.2%
1950–1959	11.4%
1940–1949	8.2%
1939 or earlier	23.9%

Bedrooms

Size	% of units
No bedroom (studio)	0.7%
1 bedroom	5.3%
2 bedrooms	25.2%
3 bedrooms	30.2%
4 bedrooms	29.8%
5+ bedrooms	8.8%

Vehicles per household

Vehicles	% of households
No vehicle	5.3%
1 vehicle	37.7%
2 vehicles	19.1%
3 or more	37.9%

Heating fuel

Fuel type	%
Utility gas	69.7%
Electricity	17.1%
Propane / LP gas	10.5%
No fuel used	0.4%

Households & families

Household type	Count	%
Married-couple family	173	37.9%
Cohabiting couple	28	6.1%
Male householder, no spouse	90	19.7%
Female householder, no spouse	165	36.2%
Households with children under 18	90	19.7%
Households with seniors (65+)	196	43.0%
Average household size	2.02

Marital status

Status	Male	Female
Never married	28.7%	19.5%
Married	55.5%	37.4%
Separated	2.0%	9.6%
Widowed	4.9%	27.4%
Divorced	8.9%	6.0%

Education

Less than 9th grade 4.2%

Some HS, no diploma 5.7%

HS graduate 35.6%

Some college, no degree 25.3%

Associate's degree 9.3%

Bachelor's degree 16.2%

Graduate / professional 3.7%

Metric	%
HS diploma or higher	90.1%
Bachelor's or higher	19.9%

School enrollment (ages 3–17)

Type	Count	%
Nursery / preschool	4	4.1%
Kindergarten	13	13.3%
Elementary school	44	44.9%
High school	29	29.6%
College / grad school	8	8.2%

Employment

Industry of employment

Agriculture & mining 26.2%

Education & healthcare 22.6%

Retail trade 12.0%

Manufacturing 9.7%

Professional & management 7.5%

Transportation & utilities 5.7%

Construction 4.2%

Other services 3.5%

Arts, food & hospitality 3.1%

Public administration 1.9%

Finance & real estate 1.7%

Information 1.4%

Wholesale trade 0.5%

Occupation

Category	%
Management, business & arts	30.2%
Service	14.4%
Sales & office	19.6%
Natural resources & construction	25.9%
Production & transportation	9.9%

Employment type

Type	%
Private sector	74.5%
Government	10.4%
Self-employed	15.1%
Unpaid family workers	0.0%

Commute

Method	%
Drive alone	65.4%
Carpool	5.6%
Public transit	1.0%
Walk	5.4%
Work from home	22.7%
Other means	0.0%
Avg commute (minutes)	29.6

Poverty

All people 15.0%

Under 18 years 20.1%

18 and over 13.8%

Married-couple families 2.9%

Female-led households 42.4%

Income support

Source	% of households
Social Security	45.0%
Retirement income	33.3%
Supplemental Security	1.1%
Cash public assistance	1.8%
Food stamps / SNAP	5.3%

Health indicators

Condition	%
Obesity	35.9%
High blood pressure	42.1%
High cholesterol	37.1%
Diabetes	13.2%
Heart disease	10.2%
Stroke	4.4%
Asthma	9.1%
Arthritis	32.5%
Kidney disease	4.0%
Pulmonary disease	8.3%
Cancer	10.4%

Behavior / access	%
Smoking	17.6%
Binge drinking	15.4%
No physical activity	26.5%
Less than 7 hrs sleep	27.7%
Depression	17.5%
Fair or poor health	15.7%
Poor mental health	10.8%
Poor physical health	11.0%
No health insurance	10.0%
Visited doctor (checkup)	75.8%
Visited dentist	63.0%
Cholesterol screening	92.1%
Teeth loss	14.9%

Veterans & disability

Veterans	Count	%
Civilian veterans	39	4.8%

Disability	%
Any disability	11.0%
Under 18	4.4%
18–64 years	8.8%
65 and over	20.4%

Health insurance coverage

Type	%
Private insurance	66.5%
Public insurance	38.2%
No insurance	15.2%
Uninsured under 19	4.2%

Language & origin

Language spoken at home (age 5+)

Language	Count	%
English only	897	90.7%
Spanish	2	0.2%
Other Indo-European	0	0.0%
Asian & Pacific Islander	2	0.2%
Other languages	0	0.0%

Place of birth & citizenship

Origin	Count	%
Native born (US)	977	98.8%
Born in same state	964	97.5%
Born in different state	756	76.4%
Foreign born	13	1.3%
Naturalized citizen	12	1.2%
Not a US citizen	0	0.0%

Ancestry

Ancestry	Count	%
Italian	99	10%
Arab	86	8.7%
Polish	64	6.5%
French	11	1.1%

Ancestry	Count	%
Irish	10	1%
English	6	0.6%
Dutch	6	0.6%
German	2	0.2%

Technology access

Metric	% of households
Computer access	46.1%
Internet access	89.7%

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

Frequently asked questions about ZIP code 58631

What city is ZIP code 58631 in?

ZIP code 58631 is primarily assigned to Glen Ullin, North Dakota.

What county is ZIP code 58631 in?

ZIP code 58631 falls within Morton County, North Dakota.

Does ZIP code 58631 have an older population?

31% of residents in ZIP code 58631 are 65 or older, above the national average of ~17%.

Does ZIP code 58631 have a large retiree population?

45% of households in ZIP code 58631 receive Social Security income, suggesting a significant retiree or disability population.

What is the typical home value in ZIP code 58631?

The median home value in ZIP code 58631 is $110,800.

What is the population of ZIP code 58631?

ZIP code 58631 has an estimated population of 989 residents, with a density of 3 people per square mile.

What timezone is ZIP code 58631 in?

ZIP code 58631 observes the CST timezone.