58011 ZIP Code — Buffalo, ND

Cass County, North Dakota

ZIP code 58011 is located in Buffalo, North Dakota, within Cass County. It covers approximately 110.80 square miles and serves a population of 441 residents. This is a standard ZIP code in the Central (CT) timezone, served by area code 701.

About ZIP code 58011

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 $225,000. Owner-occupancy is high at 91%, well above the national average.

Median household income is $91,250. The poverty rate of 6% is below the national average. 31% 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 16 minutes is near the national average.

Educational attainment is near the national average, with 35% of residents holding a bachelor's degree or higher.

Overall, ZIP code 58011 reflects a community defined by high homeownership and a significant Social Security-dependent population.

441

population

110.80

sq mi land

Standard

ZIP type

Central (CT)

timezone

58011 ZIP code map

Cities in ZIP code 58011

Below are the cities the US Postal Service accepts for ZIP code 58011. Using any city not on this list may result in mail delivery delays.

City	Status
Buffalo	Preferred

Nearby ZIP codes

58071 Tower City (6.1 mi) 58031 Fingal (12.4 mi) 58063 Oriska (13.1 mi) 58029 Erie (15 mi) 58064 Page (16.3 mi) 58012 Casselton (18.4 mi)

Demographics updated 05/2026

Population
Total population	441
Population density	4 / sq mi
State FIPS	38
County FIPS	017

Geography
Land area	110.80 sq mi
Water area	0.05 sq mi
Latitude	46.9271
Longitude	-97.5468
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	27.4%	36.6%	37.8%
$50k – $100k	37.1%	33.6%	32.8%
$100k – $200k	30.5%	22.5%	23.3%
Over $200k	5.1%	7.4%	6.0%

Demographics & statistics

441

Population

People per sq mi

48.3

Median age

$91,250

Median household income

$42,161

Per capita income

$225,000

Median home value

Median monthly rent

90.7%

Home ownership

5.7%

Poverty rate

0.9%

Unemployment

187

Housing units

34.9%

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	101	22.9%
18 and over	340	77.1%
65 and over	97	22.0%
Median age	48.3 years

Race & ethnicity

White 98%

Black or African American 0.9%

Two or more races 0.9%

American Indian / Alaska Native 0.2%

Group	Count	%
White	432	98%
Black or African American	4	0.9%
Two or more races	4	0.9%
American Indian / Alaska Native	1	0.2%

Household income

Income range	This ZIP	County avg	State avg
Under $50k	27.4%	36.6%	37.8%
$50k – $100k	37.1%	33.6%	32.8%
$100k – $200k	30.5%	22.5%	23.3%
Over $200k	5.1%	7.4%	6.0%

Under $10k 7.1%

$10k–$15k 1.1%

$15k–$25k 3.8%

$25k–$35k 0.5%

$35k–$50k 8.8%

$50k–$75k 19.2%

$75k–$100k 23.6%

$100k–$150k 18.7%

$150k–$200k 11.0%

$200k+ 6.0%

Range	% of households
Under $10k	7.1%
$10k–$15k	1.1%
$15k–$25k	3.8%
$25k–$35k	0.5%
$35k–$50k	8.8%
$50k–$75k	19.2%
$75k–$100k	23.6%
$100k–$150k	18.7%
$150k–$200k	11.0%
$200k+	6.0%
Median income	$91,250

Housing

Home values

Under $50k 6.1%

$50k–$100k 9.7%

$100k–$150k 12.1%

$150k–$200k 14.5%

$200k–$300k 22.4%

$300k–$500k 17.0%

$500k–$1M 18.2%

Housing overview

Metric	Value
Median home value	$225,000
Median rent / month	$0
Owner occupied	90.7%
Renter occupied	9.3%
Vacant	10.8%
Single-family detached	94.6%
Large apartment buildings	0.0%
Mobile homes	1.5%
Median rooms	7.3
Avg household size (owned)	2.53

Year built

Era	%
2020 or later	0.0%
2010–2019	10.3%
2000–2009	10.8%
1990–1999	8.3%
1980–1989	13.2%
1970–1979	16.2%
1960–1969	4.4%
1950–1959	3.9%
1940–1949	1.0%
1939 or earlier	31.9%

Bedrooms

Size	% of units
No bedroom (studio)	0.5%
1 bedroom	2.9%
2 bedrooms	22.1%
3 bedrooms	36.8%
4 bedrooms	8.8%
5+ bedrooms	28.9%

Vehicles per household

Vehicles	% of households
No vehicle	1.6%
1 vehicle	13.2%
2 vehicles	29.7%
3 or more	55.5%

Heating fuel

Fuel type	%
Utility gas	26.4%
Electricity	29.1%
Propane / LP gas	39.0%
Fuel oil	5.5%

Households & families

Household type	Count	%
Married-couple family	113	62.1%
Cohabiting couple	3	1.6%
Male householder, no spouse	45	24.7%
Female householder, no spouse	21	11.5%
Households with children under 18	48	26.4%
Households with seniors (65+)	68	37.4%
Average household size	2.42

Marital status

Status	Male	Female
Never married	11.2%	25.8%
Married	68.9%	62.4%
Separated	0.5%	1.7%
Widowed	8.2%	5.1%
Divorced	11.2%	5.1%

Education

Less than 9th grade 0.0%

Some HS, no diploma 2.1%

HS graduate 16.6%

Some college, no degree 28.9%

Associate's degree 17.5%

Bachelor's degree 32.8%

Graduate / professional 2.1%

Metric	%
HS diploma or higher	97.9%
Bachelor's or higher	34.9%

School enrollment (ages 3–17)

Type	Count	%
Nursery / preschool	5	4.2%
Kindergarten	1	0.8%
Elementary school	56	47.1%
High school	34	28.6%
College / grad school	23	19.3%

Employment

Industry of employment

Agriculture & mining 42.9%

Education & healthcare 14.2%

Transportation & utilities 9.9%

Finance & real estate 9.4%

Retail trade 6.4%

Construction 4.3%

Arts, food & hospitality 3.0%

Other services 3.0%

Manufacturing 2.6%

Wholesale trade 1.7%

Public administration 1.3%

Information 0.9%

Professional & management 0.4%

Occupation

Category	%
Management, business & arts	46.8%
Service	14.6%
Sales & office	19.3%
Natural resources & construction	12.0%
Production & transportation	7.3%

Employment type

Type	%
Private sector	50.6%
Government	10.3%
Self-employed	31.8%
Unpaid family workers	7.3%

Commute

Method	%
Drive alone	87.9%
Carpool	1.7%
Public transit	0.0%
Walk	8.2%
Work from home	2.2%
Other means	0.0%
Avg commute (minutes)	16.1

Poverty

All people 5.7%

Under 18 years 2.0%

18 and over 6.8%

Married-couple families 1.8%

Female-led households 0.0%

Income support

Source	% of households
Social Security	31.3%
Retirement income	24.7%
Supplemental Security	4.4%
Cash public assistance	2.7%
Food stamps / SNAP	2.7%

Health indicators

Condition	%
Obesity	34.0%
High blood pressure	34.9%
High cholesterol	34.1%
Diabetes	10.9%
Heart disease	7.2%
Stroke	3.1%
Asthma	8.8%
Arthritis	27.0%
Kidney disease	3.1%
Pulmonary disease	6.3%
Cancer	8.7%

Behavior / access	%
Smoking	16.3%
Binge drinking	18.9%
No physical activity	24.0%
Less than 7 hrs sleep	29.4%
Depression	18.5%
Fair or poor health	11.9%
Poor mental health	10.7%
Poor physical health	8.6%
No health insurance	8.5%
Visited doctor (checkup)	73.1%
Visited dentist	71.4%
Cholesterol screening	91.6%
Teeth loss	10.9%

Veterans & disability

Veterans	Count	%
Civilian veterans	31	9.1%

Disability	%
Any disability	11.3%
Under 18	0.0%
18–64 years	7.8%
65 and over	32.0%

Health insurance coverage

Type	%
Private insurance	86.8%
Public insurance	25.6%
No insurance	4.8%
Uninsured under 19	2.9%

Language & origin

Language spoken at home (age 5+)

Language	Count	%
English only	432	98.0%
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)	441	100.0%
Born in same state	440	99.8%
Born in different state	339	76.9%
Foreign born	1	0.2%
Naturalized citizen	0	0.0%
Not a US citizen	0	0.0%

Ancestry

Ancestry	Count	%
Polish	176	39.9%
Italian	33	7.5%
French	19	4.3%

Ancestry	Count	%
English	7	1.6%
Dutch	4	0.9%
Arab	2	0.5%

Technology access

Metric	% of households
Computer access	41.3%
Internet access	95.6%

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

Frequently asked questions about ZIP code 58011

What city is ZIP code 58011 in?

ZIP code 58011 is primarily assigned to Buffalo, North Dakota.

What county is ZIP code 58011 in?

ZIP code 58011 falls within Cass County, North Dakota.

Is ZIP code 58011 mostly owner-occupied?

91% of occupied units in ZIP code 58011 are owner-occupied, well above the national average.

Does ZIP code 58011 have a large veteran population?

9% of civilians in ZIP code 58011 are veterans, above the national average of ~7%.

What is the population of ZIP code 58011?

ZIP code 58011 has an estimated population of 441 residents, with a density of 4 people per square mile.

What is the median household income in ZIP code 58011?

The median household income in ZIP code 58011 is $91,250, above the national median of ~$75,000.

What timezone is ZIP code 58011 in?

ZIP code 58011 observes the CST timezone.