57481 ZIP Code — Westport, SD

Brown County, South Dakota

ZIP code 57481 is located in Westport, South Dakota, within Brown County. It covers approximately 188.49 square miles and serves a population of 375 residents. This is a standard ZIP code in the Central (CT) timezone, served by area code 605.

About ZIP code 57481

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 $162,500. Owner-occupancy is high at 96%, well above the national average.

The gap between median ($71,250) and mean household income suggests income inequality — a small number of higher earners pull the average up. 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 22 minutes is near the national average.

Educational attainment is near the national average, with 23% of residents holding a bachelor's degree or higher.

Notable community characteristics include a notable veteran presence at 15% of civilians, above the national average of 7%.

Overall, ZIP code 57481 reflects a community defined by a strong veteran community, high homeownership, and a significant Social Security-dependent population.

375

population

188.49

sq mi land

Standard

ZIP type

Central (CT)

timezone

57481 ZIP code map

Cities in ZIP code 57481

Below are the cities the US Postal Service accepts for ZIP code 57481. Using any city not on this list may result in mail delivery delays.

City	Status
Westport	Acceptable
Westport	Preferred

Nearby ZIP codes

57401 Aberdeen (13.5 mi) 57441 Frederick (14.8 mi) 57433 Columbia (17.3 mi) 57456 Leola (18.1 mi) 57451 Ipswich (18.9 mi) 57427 Bath (19.4 mi)

Demographics updated 05/2026

Population
Total population	375
Population density	2 / sq mi
State FIPS	46
County FIPS	013

Geography
Land area	188.49 sq mi
Water area	0.30 sq mi
Latitude	45.6424
Longitude	-98.6525
Timezone	Central (CT)
Area code	605

Total population by age

Gender

Race & ethnicity

Economics updated 05/2026

Household income

Income range	This ZIP	County avg	State avg
Under $50k	40.3%	39.9%	41.7%
$50k – $100k	28.5%	34.8%	33.8%
$100k – $200k	28.5%	20.4%	20.1%
Over $200k	2.7%	4.9%	4.4%

Demographics & statistics

375

Population

People per sq mi

41.3

Median age

$71,250

Median household income

$38,793

Per capita income

$162,500

Median home value

Median monthly rent

96.0%

Home ownership

4.3%

Poverty rate

0.0%

Unemployment

172

Housing units

22.5%

Bachelor's or higher

Age distribution

Male Female

Under 5

5–9

10–14

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	89	23.7%
18 and over	286	76.3%
65 and over	74	19.7%
Median age	41.3 years

Race & ethnicity

White 95.8%

Two or more races 2.7%

Hispanic or Latino 0.5%

American Indian / Alaska Native 0.5%

Other race 0.5%

Group	Count	%
White	361	95.8%
Two or more races	10	2.7%
Hispanic or Latino	2	0.5%
American Indian / Alaska Native	2	0.5%
Other race	2	0.5%

Household income

Income range	This ZIP	County avg	State avg
Under $50k	40.3%	39.9%	41.7%
$50k – $100k	28.5%	34.8%	33.8%
$100k – $200k	28.5%	20.4%	20.1%
Over $200k	2.7%	4.9%	4.4%

Under $10k 1.3%

$10k–$15k 3.3%

$15k–$25k 7.3%

$25k–$35k 2.7%

$35k–$50k 12.0%

$50k–$75k 32.0%

$75k–$100k 2.0%

$100k–$150k 12.7%

$150k–$200k 20.0%

$200k+ 6.7%

Range	% of households
Under $10k	1.3%
$10k–$15k	3.3%
$15k–$25k	7.3%
$25k–$35k	2.7%
$35k–$50k	12.0%
$50k–$75k	32.0%
$75k–$100k	2.0%
$100k–$150k	12.7%
$150k–$200k	20.0%
$200k+	6.7%
Median income	$71,250

Housing

Home values

Under $50k 6.9%

$50k–$100k 18.8%

$100k–$150k 19.4%

$150k–$200k 13.9%

$200k–$300k 13.2%

$300k–$500k 20.1%

$500k–$1M 6.3%

$1M+ 1.4%

Housing overview

Metric	Value
Median home value	$162,500
Median rent / month	$0
Owner occupied	96.0%
Renter occupied	4.0%
Vacant	15.7%
Single-family detached	87.1%
Large apartment buildings	0.0%
Mobile homes	5.6%
Median rooms	7.1
Avg household size (owned)	2.44

Year built

Era	%
2020 or later	0.0%
2010–2019	3.4%
2000–2009	8.4%
1990–1999	10.1%
1980–1989	11.8%
1970–1979	19.7%
1960–1969	6.2%
1950–1959	6.7%
1940–1949	6.7%
1939 or earlier	27.0%

Bedrooms

Size	% of units
No bedroom (studio)	1.1%
1 bedroom	0.6%
2 bedrooms	14.0%
3 bedrooms	41.6%
4 bedrooms	25.3%
5+ bedrooms	17.4%

Vehicles per household

Vehicles	% of households
No vehicle	2.7%
1 vehicle	12.7%
2 vehicles	40.0%
3 or more	44.7%

Heating fuel

Fuel type	%
Electricity	32.0%
Propane / LP gas	62.0%
No fuel used	6.0%

Households & families

Household type	Count	%
Married-couple family	93	62.0%
Cohabiting couple	4	2.7%
Male householder, no spouse	30	20.0%
Female householder, no spouse	23	15.3%
Households with children under 18	44	29.3%
Households with seniors (65+)	56	37.3%
Average household size	2.50

Marital status

Status	Male	Female
Never married	18.1%	5.3%
Married	59.4%	72.5%
Separated	0.0%	0.0%
Widowed	17.4%	15.3%
Divorced	5.2%	6.9%

Education

Less than 9th grade 4.4%

Some HS, no diploma 3.3%

HS graduate 35.3%

Some college, no degree 25.5%

Associate's degree 9.1%

Bachelor's degree 12.7%

Graduate / professional 9.8%

Metric	%
HS diploma or higher	92.4%
Bachelor's or higher	22.5%

School enrollment (ages 3–17)

Type	Count	%
Nursery / preschool	0	0.0%
Kindergarten	0	0.0%
Elementary school	33	76.7%
High school	0	0.0%
College / grad school	10	23.3%

Employment

Industry of employment

Agriculture & mining 27.0%

Professional & management 15.2%

Education & healthcare 12.9%

Finance & real estate 10.7%

Public administration 9.0%

Construction 6.2%

Retail trade 5.1%

Arts, food & hospitality 5.1%

Manufacturing 3.9%

Other services 2.8%

Transportation & utilities 2.2%

Occupation

Category	%
Management, business & arts	45.5%
Service	10.1%
Sales & office	13.5%
Natural resources & construction	27.0%
Production & transportation	3.9%

Employment type

Type	%
Private sector	74.2%
Government	9.0%
Self-employed	11.2%
Unpaid family workers	5.6%

Commute

Method	%
Drive alone	78.2%
Carpool	13.8%
Public transit	0.0%
Walk	6.9%
Work from home	1.1%
Other means	0.0%
Avg commute (minutes)	22.0

Poverty

All people 4.3%

Under 18 years 0.0%

18 and over 5.6%

Married-couple families 4.3%

Female-led households 0.0%

Income support

Source	% of households
Social Security	34.0%
Retirement income	10.0%
Supplemental Security	3.3%
Cash public assistance	0.0%
Food stamps / SNAP	2.7%

Health indicators

Condition	%
Obesity	34.5%
High blood pressure	30.7%
High cholesterol	30.8%
Diabetes	8.5%
Heart disease	6.0%
Stroke	2.7%
Asthma	8.4%
Arthritis	23.2%
Kidney disease	2.6%
Pulmonary disease	5.4%
Cancer	6.5%

Behavior / access	%
Smoking	18.8%
Binge drinking	21.2%
No physical activity	22.8%
Less than 7 hrs sleep	29.4%
Depression	15.8%
Fair or poor health	10.4%
Poor mental health	10.6%
Poor physical health	8.3%
No health insurance	11.7%
Visited doctor (checkup)	74.2%
Visited dentist	68.9%
Cholesterol screening	88.8%
Teeth loss	13.3%

Veterans & disability

Veterans	Count	%
Civilian veterans	42	14.7%

Disability	%
Any disability	11.5%
Under 18	0.0%
18–64 years	0.9%
65 and over	55.4%

Health insurance coverage

Type	%
Private insurance	92.0%
Public insurance	21.6%
No insurance	4.3%
Uninsured under 19	0.0%

Language & origin

Language spoken at home (age 5+)

Language	Count	%
English only	324	86.4%
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)	375	100.0%
Born in same state	375	100.0%
Born in different state	278	74.1%
Foreign born	0	0.0%
Naturalized citizen	0	0.0%
Not a US citizen	0	0.0%

Ancestry

Ancestry	Count	%
Polish	51	13.6%
French	33	8.8%

Ancestry	Count	%
Arab	31	8.3%
Italian	8	2.1%

Technology access

Metric	% of households
Computer access	40.0%
Internet access	92.7%

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

Frequently asked questions about ZIP code 57481

What city is ZIP code 57481 in?

ZIP code 57481 is primarily assigned to Westport, South Dakota.

What county is ZIP code 57481 in?

ZIP code 57481 falls within Brown County, South Dakota.

Is ZIP code 57481 mostly owner-occupied?

96% of occupied units in ZIP code 57481 are owner-occupied, well above the national average.

Does ZIP code 57481 have a large veteran population?

15% of civilians in ZIP code 57481 are veterans, above the national average of ~7%.

What is the typical home value in ZIP code 57481?

The median home value in ZIP code 57481 is $162,500.

What is the population of ZIP code 57481?

ZIP code 57481 has an estimated population of 375 residents, with a density of 2 people per square mile.

What timezone is ZIP code 57481 in?

ZIP code 57481 observes the CST timezone.