57620 ZIP Code — Bison, SD

Perkins County, South Dakota

ZIP code 57620 is located in Bison, South Dakota, within Perkins County. It covers approximately 348.17 square miles and serves a population of 606 residents. This is a standard ZIP code in the Mountain (MT) timezone, served by area code 605.

About ZIP code 57620

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 $93,300. Owner-occupancy is high at 78%, well above the national average.

Median household income is $70,000. The poverty rate of 4% is below the national average. 34% 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 11 minutes is near the national average. Remote work is prevalent — 25% of workers work from home.

Educational attainment is near the national average, with 21% of residents holding a bachelor's degree or higher.

Overall, ZIP code 57620 reflects a community defined by high homeownership, a high rate of remote workers, and a significant Social Security-dependent population.

606

population

348.17

sq mi land

Standard

ZIP type

Mountain (MT)

timezone

57620 ZIP code map

Cities in ZIP code 57620

Below are the cities the US Postal Service accepts for ZIP code 57620. Using any city not on this list may result in mail delivery delays.

City	Status
Bison	Acceptable
Bison	Preferred

Demographics updated 06/2026

Population
Total population	606
Population density	2 / sq mi
State FIPS	46
County FIPS	105

Geography
Land area	348.17 sq mi
Water area	1.89 sq mi
Latitude	45.4488
Longitude	-102.5189
Timezone	Mountain (MT)
Area code	605

Total population by age

Gender

Race & ethnicity

Economics updated 06/2026

Household income

Income range	This ZIP	County avg	State avg
Under $50k	36.2%	40.7%	41.7%
$50k – $100k	53.5%	40.0%	33.8%
$100k – $200k	9.2%	16.1%	20.1%
Over $200k	1.2%	3.1%	4.4%

Demographics & statistics

606

Population

People per sq mi

45.6

Median age

$70,000

Median household income

$37,025

Per capita income

$93,300

Median home value

$944

Median monthly rent

77.6%

Home ownership

4.1%

Poverty rate

0.0%

Unemployment

273

Housing units

21.0%

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	160	26.4%
18 and over	446	73.6%
65 and over	130	21.5%
Median age	45.6 years

Race & ethnicity

White 96.7%

Two or more races 2%

Hispanic or Latino 0.7%

Other race 0.7%

Group	Count	%
White	590	96.7%
Two or more races	12	2%
Hispanic or Latino	4	0.7%
Other race	4	0.7%

Household income

Income range	This ZIP	County avg	State avg
Under $50k	36.2%	40.7%	41.7%
$50k – $100k	53.5%	40.0%	33.8%
$100k – $200k	9.2%	16.1%	20.1%
Over $200k	1.2%	3.1%	4.4%

Under $10k 2.2%

$10k–$15k 1.5%

$15k–$25k 5.2%

$25k–$35k 6.3%

$35k–$50k 17.2%

$50k–$75k 22.4%

$75k–$100k 19.8%

$100k–$150k 14.2%

$150k–$200k 6.7%

$200k+ 4.5%

Range	% of households
Under $10k	2.2%
$10k–$15k	1.5%
$15k–$25k	5.2%
$25k–$35k	6.3%
$35k–$50k	17.2%
$50k–$75k	22.4%
$75k–$100k	19.8%
$100k–$150k	14.2%
$150k–$200k	6.7%
$200k+	4.5%
Median income	$70,000

Housing

Home values

Under $50k 31.7%

$50k–$100k 20.2%

$100k–$150k 14.4%

$150k–$200k 8.2%

$200k–$300k 17.3%

$300k–$500k 5.3%

$500k–$1M 2.9%

Housing overview

Metric	Value
Median home value	$93,300
Median rent / month	$944
Owner occupied	77.6%
Renter occupied	22.4%
Vacant	19.5%
Single-family detached	73.9%
Large apartment buildings	0.9%
Mobile homes	15.0%
Median rooms	5.6
Avg household size (owned)	2.41

Year built

Era	%
2020 or later	0.0%
2010–2019	6.0%
2000–2009	7.5%
1990–1999	3.0%
1980–1989	6.6%
1970–1979	15.0%
1960–1969	14.1%
1950–1959	7.8%
1940–1949	3.6%
1939 or earlier	36.3%

Bedrooms

Size	% of units
No bedroom (studio)	4.8%
1 bedroom	8.7%
2 bedrooms	27.6%
3 bedrooms	35.7%
4 bedrooms	10.2%
5+ bedrooms	12.9%

Vehicles per household

Vehicles	% of households
No vehicle	1.5%
1 vehicle	17.2%
2 vehicles	34.0%
3 or more	47.4%

Heating fuel

Fuel type	%
Utility gas	3.0%
Electricity	50.0%
Propane / LP gas	45.5%
Wood	0.7%
No fuel used	0.4%

Households & families

Household type	Count	%
Married-couple family	177	66.0%
Cohabiting couple	4	1.5%
Male householder, no spouse	42	15.7%
Female householder, no spouse	45	16.8%
Households with children under 18	76	28.4%
Households with seniors (65+)	87	32.5%
Average household size	2.26

Marital status

Status	Male	Female
Never married	16.2%	8.9%
Married	75.7%	74.7%
Separated	0.0%	7.1%
Widowed	3.8%	4.0%
Divorced	4.3%	5.3%

Education

Less than 9th grade 1.4%

Some HS, no diploma 2.5%

HS graduate 37.2%

Some college, no degree 28.6%

Associate's degree 9.2%

Bachelor's degree 18.0%

Graduate / professional 3.0%

Metric	%
HS diploma or higher	96.1%
Bachelor's or higher	21.0%

School enrollment (ages 3–17)

Type	Count	%
Nursery / preschool	21	18.8%
Kindergarten	9	8.0%
Elementary school	54	48.2%
High school	22	19.6%
College / grad school	6	5.4%

Employment

Industry of employment

Agriculture & mining 19.8%

Education & healthcare 15.4%

Construction 10.7%

Professional & management 9.1%

Retail trade 8.8%

Transportation & utilities 8.2%

Other services 6.6%

Finance & real estate 5.3%

Arts, food & hospitality 5.3%

Public administration 5.0%

Information 4.7%

Wholesale trade 0.9%

Occupation

Category	%
Management, business & arts	40.9%
Service	12.6%
Sales & office	17.9%
Natural resources & construction	18.9%
Production & transportation	9.7%

Employment type

Type	%
Private sector	45.3%
Government	21.7%
Self-employed	33.0%
Unpaid family workers	0.0%

Commute

Method	%
Drive alone	64.8%
Carpool	2.5%
Public transit	0.6%
Walk	5.3%
Work from home	24.5%
Other means	2.2%
Avg commute (minutes)	10.9

Poverty

All people 4.1%

Under 18 years 5.0%

18 and over 3.8%

Married-couple families 2.8%

Female-led households 0.0%

Income support

Source	% of households
Social Security	33.6%
Retirement income	19.8%
Supplemental Security	1.1%
Cash public assistance	0.0%
Food stamps / SNAP	0.7%

Health indicators

Condition	%
Obesity	33.4%
High blood pressure	36.3%
High cholesterol	33.4%
Diabetes	10.8%
Heart disease	9.2%
Stroke	4.0%
Asthma	8.8%
Arthritis	29.4%
Kidney disease	3.7%
Pulmonary disease	7.3%
Cancer	9.3%

Behavior / access	%
Smoking	16.7%
Binge drinking	16.5%
No physical activity	24.2%
Less than 7 hrs sleep	29.3%
Depression	14.7%
Fair or poor health	13.0%
Poor mental health	9.8%
Poor physical health	10.0%
No health insurance	11.3%
Visited doctor (checkup)	76.4%
Visited dentist	68.1%
Cholesterol screening	90.9%
Teeth loss	14.6%

Veterans & disability

Veterans	Count	%
Civilian veterans	23	5.2%

Disability	%
Any disability	8.6%
Under 18	0.0%
18–64 years	5.1%
65 and over	27.7%

Health insurance coverage

Type	%
Private insurance	84.8%
Public insurance	29.9%
No insurance	3.8%
Uninsured under 19	3.7%

Language & origin

Language spoken at home (age 5+)

Language	Count	%
English only	533	88.0%
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)	606	100.0%
Born in same state	606	100.0%
Born in different state	249	41.1%
Foreign born	0	0.0%
Naturalized citizen	0	0.0%
Not a US citizen	0	0.0%

Ancestry

Ancestry	Count	%
Polish	184	30.4%
Arab	85	14%
French	45	7.4%

Ancestry	Count	%
Italian	44	7.3%
English	17	2.8%

Technology access

Metric	% of households
Computer access	44.2%
Internet access	92.5%

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

Frequently asked questions about ZIP code 57620

What city is ZIP code 57620 in?

ZIP code 57620 is primarily assigned to Bison, South Dakota.

What county is ZIP code 57620 in?

ZIP code 57620 falls within Perkins County, South Dakota.

What is the typical home value in ZIP code 57620?

The median home value in ZIP code 57620 is $93,300.

What is the population of ZIP code 57620?

ZIP code 57620 has an estimated population of 606 residents, with a density of 2 people per square mile.

What is the median household income in ZIP code 57620?

The median household income in ZIP code 57620 is $70,000, below the national median of ~$75,000.

What timezone is ZIP code 57620 in?

ZIP code 57620 observes the MST timezone.