PlainZIP

Westport, SD · standard

ZIP Code 57481

Brown County, South Dakota - Census ACS demographics, housing tenure, and business patterns, benchmarked against every US ZIP.

598
1/sq mi
$68,125
Median income
$215,600
Median home value
12.4%
Bachelor's or higher

The verdict

Westport pairs a below-median household income with below-median home values, in a rural, homeowner-dominated area.

44th pct
household income, US ZIPs
48th pct
home value, US ZIPs
1
people per sq mi
95%
owner-occupied homes

Source: U.S. Census Bureau ACS 5-Year Estimates (2019–2023). Percentiles rank ZIP 57481 against every reporting US ZIP.

ZIP code 57481 is a sparsely populated ZIP (a standard USPS delivery area) in Westport, Brown County, South Dakota, home to just 598 residents across 460.0 square miles, a density of 1 people per square mile, in the Chicago time zone.

ZIP 57481 reports a modest median household income of $68,125 (11% below the South Dakota average), while per-capita income is $37,896. Poverty here runs at 4.8%, with unemployment measured at 0.0%. Median home value sits at $215,600 (12% above the state average), median rent at - a month, and owner-occupancy at 95.0%.

Formal educational attainment runs low here: just 12.4% of adults hold a bachelor's degree or higher, the median age is 54.2, and the average commute is -. Use the benchmarks above to see where 57481 sits relative to South Dakota and the national baseline rather than viewing the numbers in isolation.

Every figure on this page is sourced from the U.S. Census Bureau American Community Survey 5-Year Estimates (including median rent) and the FHFA House Price Index, no estimates, no proprietary scoring. Verify with Census →

Source: U.S. Census Bureau, American Community Survey 5-Year Estimates + ZIP Code Business Patterns + FHFA HPI ACS demographics and median rent, ZBP business establishments, FHFA HPI for ZIP 57481, Westport, SD · 2023 Census ACS 5-Year Estimates use a rolling 60-month sample for stable small-geography estimates; ZBP updated annually; FHFA HPI updated quarterly/annually.

Quick Facts

598

Population

460.0

Area (sq mi)

1

People / sq mi

Chicago

Time Zone

standard

ZIP Type

Neighborhood Scorecard
Get an A-F grade across income, safety, housing, rent, education, commute, and childcare for this ZIP code.
View Scorecard →

Who lives in ZIP 57481?

54.2

Median Age

60.9%

Male

39.1%

Female

0.4%

Foreign-Born

White 93.4%
African American 0.0%
Asian 0.4%
American Indian or Alaska Native 0.4%
Native Hawaiian or Pacific Islander 0.0%
Two or More Ethnicities 5.2%
Hispanic or Latino 0.0%

Hispanic or Latino is an ethnicity category from the Census Bureau and may overlap with other categories above.

Source: U.S. Census Bureau, ACS 5-Year Estimates (2023)

How much do residents earn?

$68,125

Median Household Income

-11% vs state

$37,896

Per Capita Income

4.8%

Poverty Rate

0.0%

Unemployment Rate

How ZIP 57481 ranks nationally

Westport, SD household income vs. every US ZIP code

Median household income, the full national distribution, with this ZIP marked

$68,125 44th percentile higher than 44% of 30,318 US ZIPs

$0–$20,000: 118 US ZIPs (0%). Below this entry. $20,000–$40,000: 1,573 US ZIPs (5%). Below this entry. $40,000–$60,000: 7,092 US ZIPs (23%). Below this entry. $60,000–$80,000: 9,980 US ZIPs (33%). This entry sits in this band. $80,000–$100,000: 5,778 US ZIPs (19%). Above this entry. $100,000–$120,000: 2,855 US ZIPs (9%). Above this entry. $120,000–$140,000: 1,362 US ZIPs (4%). Above this entry. $140,000–$160,000: 686 US ZIPs (2%). Above this entry. $160,000–$180,000: 364 US ZIPs (1%). Above this entry. $180,000–$200,000: 186 US ZIPs (1%). Above this entry. $200,000–$220,000: 324 US ZIPs (1%). Above this entry. This ZIP $0 $200K+ every reporting US ZIP, bucketed by value

Each bar is a $20K-wide band; taller bars hold more US ZIPs. The dashed line + filled bar mark this entry. Hover or tap any bar for its full count, share, and where it sits relative to this entry.

Source U.S. Census Bureau, ACS 5-Year Estimates · 2019–2023

Source: U.S. Census Bureau, ACS 5-Year Estimates (2023)

What is the education profile here?

High School Graduate or Higher 54.5%
Bachelor's Degree or Higher 12.4%

Source: U.S. Census Bureau, ACS 5-Year Estimates (2023)

What does housing look like?

149

Total Housing Units

121

Occupied Units

28

Vacant Units

2.24

Avg Household Size

Occupancy Type

Owner 95.0%
Renter 5.0%

$215,600

Median Home Value

+12% vs state

1975

Median Year Built

Source: U.S. Census Bureau, ACS 5-Year Estimates (2023)

What businesses operate in this ZIP?

Census Bureau data shows 11 business establishments in ZIP 57481, employing approximately 48 people with a combined annual payroll of $3,735,000.

11

Businesses

48

Employees

$3.7M

Annual Payroll

1

Industry Sectors

Industry Establishments % of Total
Construction 3 27.3%

Source: U.S. Census Bureau, ZIP Code Business Patterns (ZBP), 2023. Employment figures may include noise for disclosure avoidance.

More ZIP Codes in Brown County

57401 standard
Aberdeen, SD
Pop: 30,061
57445 standard
Groton, SD
Pop: 2,068
57479 standard
Warner, SD
Pop: 666
57427 standard
Bath, SD
Pop: 620
57441 standard
Frederick, SD
Pop: 607
57446 standard
Hecla, SD
Pop: 472

Related Areas

Brown County Westport, SD South Dakota

Frequently Asked Questions

What county is ZIP code 57481 in? ▼
ZIP code 57481 (Westport) is located in Brown County, South Dakota. Brown County contains multiple ZIP codes, see the full list at /counties/brown-sd.
What is the population of ZIP code 57481? ▼
ZIP code 57481 in Westport, SD has a population of 598 according to the Census Bureau ACS 2023 estimates.
What is the median household income in ZIP 57481? ▼
The median household income in ZIP 57481 is $68,125, which is 11% below the national average of $76,288.
What is the average home value in ZIP 57481? ▼
The median home value in ZIP 57481 is $215,600, which is 22% below the national average of $278,155.
What is the demographic makeup of ZIP 57481? ▼
The largest racial group in ZIP 57481 is White at 93.4%.
How many businesses are in ZIP code 57481? ▼
ZIP code 57481 has 11 business establishments employing approximately 48 people, according to Census Bureau ZIP Code Business Patterns (ZBP) 2023 data.
What is the education level in ZIP code 57481? ▼
In ZIP code 57481, 54.5% of residents aged 25+ have a high school diploma or higher, and 12.4% hold a bachelor's degree or higher. These figures come from the Census Bureau ACS 5-Year Estimates (2023).
What percentage of residents own vs. rent in ZIP 57481? ▼
In ZIP code 57481, approximately 95.0% of occupied housing units are owner-occupied and 5.0% are renter-occupied, based on Census ACS 2023 data.
What is the poverty rate in ZIP code 57481? ▼
The poverty rate in ZIP code 57481 is 4.8% according to Census Bureau ACS 2023 estimates. This measures the percentage of the population living below the federal poverty threshold.

Read our methodology to see how this data is sourced, computed, and verified.