57521 ZIP Code — Belvidere, SD

Jackson County, South Dakota

ZIP code 57521 is located in Belvidere, South Dakota, within Jackson County. It covers approximately 427.88 square miles and serves a population of 201 residents. This is a standard ZIP code in the Mountain (MT) timezone, served by area code 605.

About ZIP code 57521

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 $46,700. Owner-occupancy sits near the national average at 61%.

Median household income is $25,893. Poverty affects 37% of residents, above the national average. 68% of households receive Social Security income, suggesting a notable retiree or disability population.

The dominant occupation class is sales and office, with public administration as the leading industry. Remote work is prevalent — 27% of workers work from home.

Health indicators show elevated rates of smoking (23%) compared to national benchmarks.

Notable community characteristics include a notable veteran presence at 16% of civilians, above the national average of 7%.

Overall, ZIP code 57521 reflects a community defined by economic challenges above the national average, a strong veteran community, a high rate of remote workers, and a significant Social Security-dependent population.

201

population

427.88

sq mi land

Standard

ZIP type

Mountain (MT)

timezone

57521 ZIP code map

Cities in ZIP code 57521

Below are the cities the US Postal Service accepts for ZIP code 57521. Using any city not on this list may result in mail delivery delays.

City	Status
Belvidere	Preferred

Demographics updated 06/2026

Population
Total population	201
Population density	0 / sq mi
State FIPS	46
County FIPS	071

Geography
Land area	427.88 sq mi
Water area	2.31 sq mi
Latitude	43.8865
Longitude	-101.2433
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	85.3%	74.4%	41.7%
$50k – $100k	5.9%	21.6%	33.8%
$100k – $200k	8.8%	4.0%	20.1%
Over $200k	0.0%	0.0%	4.4%

Demographics & statistics

201

Population

28.4

Median age

$25,893

Median household income

$9,491

Per capita income

$46,700

Median home value

Median monthly rent

61.0%

Home ownership

36.5%

Poverty rate

0.0%

Unemployment

Housing units

0.0%

Bachelor's or higher

Age distribution

Male Female

Under 5

5–9

10–14

25–34

35–44

45–54

55–59

65–74

75–84

85+

← Male

Female →

Age summary

Group	Count	%
Under 18	95	47.3%
18 and over	106	52.7%
65 and over	60	29.9%
Median age	28.4 years

Race & ethnicity

White 61.7%

American Indian / Alaska Native 33.5%

Hispanic or Latino 2.4%

Other race 2.4%

Group	Count	%
White	127	61.7%
American Indian / Alaska Native	69	33.5%
Hispanic or Latino	5	2.4%
Other race	5	2.4%

Household income

Income range	This ZIP	County avg	State avg
Under $50k	85.3%	74.4%	41.7%
$50k – $100k	5.9%	21.6%	33.8%
$100k – $200k	8.8%	4.0%	20.1%
Over $200k	0.0%	0.0%	4.4%

Under $10k 32.2%

$15k–$25k 13.6%

$25k–$35k 11.9%

$35k–$50k 11.9%

$50k–$75k 27.1%

$75k–$100k 3.4%

Range	% of households
Under $10k	32.2%
$15k–$25k	13.6%
$25k–$35k	11.9%
$35k–$50k	11.9%
$50k–$75k	27.1%
$75k–$100k	3.4%
Median income	$25,893

Housing

Home values

Under $50k 58.3%

$50k–$100k 11.1%

$100k–$150k 30.6%

Housing overview

Metric	Value
Median home value	$46,700
Median rent / month	$0
Owner occupied	61.0%
Renter occupied	39.0%
Vacant	24.4%
Single-family detached	74.4%
Large apartment buildings	0.0%
Mobile homes	25.6%
Median rooms	7.5
Avg household size (owned)	3.28

Year built

Era	%
2020 or later	0.0%
2010–2019	0.0%
2000–2009	16.7%
1990–1999	2.6%
1980–1989	7.7%
1970–1979	11.5%
1960–1969	14.1%
1950–1959	10.3%
1940–1949	9.0%
1939 or earlier	28.2%

Bedrooms

Size	% of units
No bedroom (studio)	0.0%
1 bedroom	0.0%
2 bedrooms	34.6%
3 bedrooms	55.1%
4 bedrooms	10.3%
5+ bedrooms	0.0%

Vehicles per household

Vehicles	% of households
No vehicle	0.0%
1 vehicle	45.8%
2 vehicles	22.0%
3 or more	32.2%

Heating fuel

Fuel type	%
Electricity	16.9%
Propane / LP gas	83.1%

Households & families

Household type	Count	%
Married-couple family	23	39.0%
Cohabiting couple	0	0.0%
Male householder, no spouse	26	44.1%
Female householder, no spouse	10	16.9%
Households with children under 18	16	27.1%
Households with seniors (65+)	48	81.4%
Average household size	3.41

Marital status

Status	Male	Female
Never married	0.0%	15.4%
Married	51.9%	53.8%
Separated	0.0%	0.0%
Widowed	20.4%	3.8%
Divorced	27.8%	26.9%

Education

Less than 9th grade 0.0%

Some HS, no diploma 7.5%

HS graduate 59.4%

Some college, no degree 31.1%

Associate's degree 1.9%

Bachelor's degree 0.0%

Graduate / professional 0.0%

Metric	%
HS diploma or higher	92.5%
Bachelor's or higher	0.0%

School enrollment (ages 3–17)

Type	Count	%
Nursery / preschool	3	4.3%
Kindergarten	13	18.8%
Elementary school	31	44.9%
High school	19	27.5%
College / grad school	3	4.3%

Employment

Industry of employment

Public administration 34.6%

Agriculture & mining 26.9%

Retail trade 23.1%

Transportation & utilities 7.7%

Education & healthcare 7.7%

Occupation

Category	%
Management, business & arts	34.6%
Service	23.1%
Sales & office	42.3%
Natural resources & construction	0.0%
Production & transportation	0.0%

Employment type

Type	%
Private sector	38.5%
Government	34.6%
Self-employed	26.9%
Unpaid family workers	0.0%

Commute

Method	%
Drive alone	73.1%
Carpool	0.0%
Public transit	0.0%
Walk	0.0%
Work from home	26.9%
Other means	0.0%
Avg commute (minutes)	0.0

Poverty

All people 36.5%

Under 18 years 53.5%

18 and over 22.6%

Married-couple families 0.0%

Female-led households 100.0%

Income support

Source	% of households
Social Security	67.8%
Retirement income	3.4%
Supplemental Security	0.0%
Cash public assistance	0.0%
Food stamps / SNAP	13.6%

Health indicators

Condition	%
Obesity	35.0%
High blood pressure	40.5%
High cholesterol	35.7%
Diabetes	14.7%
Heart disease	10.6%
Stroke	5.3%
Asthma	10.3%
Arthritis	30.8%
Kidney disease	4.6%
Pulmonary disease	10.2%
Cancer	8.4%

Behavior / access	%
Smoking	22.8%
Binge drinking	17.5%
No physical activity	28.3%
Less than 7 hrs sleep	29.6%
Depression	15.5%
Fair or poor health	18.7%
Poor mental health	12.0%
Poor physical health	13.2%
No health insurance	14.0%
Visited doctor (checkup)	77.2%
Visited dentist	58.0%
Cholesterol screening	87.8%
Teeth loss	20.8%

Veterans & disability

Veterans	Count	%
Civilian veterans	17	16.0%

Disability	%
Any disability	16.9%
Under 18	0.0%
18–64 years	21.7%
65 and over	40.0%

Health insurance coverage

Type	%
Private insurance	24.4%
Public insurance	83.6%
No insurance	13.4%
Uninsured under 19	0.0%

Language & origin

Language spoken at home (age 5+)

Language	Count	%
English only	172	85.6%
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)	201	100.0%
Born in same state	201	100.0%
Born in different state	189	94.0%
Foreign born	0	0.0%
Naturalized citizen	0	0.0%
Not a US citizen	0	0.0%

Ancestry

Ancestry	Count	%
Italian	51	25.4%
Polish	15	7.5%

Ancestry	Count	%
French	7	3.5%

Technology access

Metric	% of households
Computer access	29.4%
Internet access	44.1%

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

Frequently asked questions about ZIP code 57521

What city is ZIP code 57521 in?

ZIP code 57521 is primarily assigned to Belvidere, South Dakota.

What county is ZIP code 57521 in?

ZIP code 57521 falls within Jackson County, South Dakota.

Does ZIP code 57521 have a large retiree population?

68% of households in ZIP code 57521 receive Social Security income, suggesting a significant retiree or disability population.

What is the poverty rate in ZIP code 57521?

37% of residents in ZIP code 57521 live below the poverty line, above the national average.

Does ZIP code 57521 have an older population?

30% of residents in ZIP code 57521 are 65 or older, above the national average of ~17%.

Does ZIP code 57521 have a large veteran population?

16% of civilians in ZIP code 57521 are veterans, above the national average of ~7%.

What timezone is ZIP code 57521 in?

ZIP code 57521 observes the MST timezone.