ZIP Code Tabulation Area · South Dakota

ZIP Code 57421: Marshall County, SD

ZIP Code 57421 (Marshall County, South Dakota) has an estimated 75 residents in 18 households. The median household income is —, the median home value is — and the median gross rent is —. Figures are U.S. Census Bureau American Community Survey 2020–2024 5-year estimates for the matching ZIP Code Tabulation Area.

American Community Survey 2020–2024 5-year estimates · Updated Oct 26, 2026

Some estimates have a large margin of error. 7 figures for this ZIP (population, median age, households, poverty rate, unemployment, bachelor's or higher, work from home) are marked with *. ACS figures come from a sample, and small areas have fewer responses, so treat these numbers as rough ranges.

Total population

75*

Margin of error ±90· estimate has a large margin of error

Median household income

—

Margin of error not available

Median home value

—

Margin of error not available

Median gross rent

—

Margin of error not available

Median age

16.6 yrs*

Margin of error ±33.8 yrs· estimate has a large margin of error

Mean travel time to work

—

Margin of error not available

How ZIP 57421 compares with South Dakota and the U.S.

State and national figures are the Census Bureau's own estimates for those areas from the same ACS release, not averages of ZIP codes.

Median age

ZIP 5742116.6 yrs*South Dakota38.0 yrsUnited States38.9 yrs

Median household income

ZIP 57421—South Dakota$75,081United States$80,734

Per capita income

ZIP 57421$33,005South Dakota$40,550United States$44,673

Poverty rate

ZIP 574210.0%*South Dakota11.9%United States12.5%

Unemployment rate

ZIP 574210.0%*South Dakota2.9%United States5.2%

Bachelor's degree or higher

ZIP 5742190.9%*South Dakota31.9%United States35.7%

Median home value

ZIP 57421—South Dakota$257,400United States$332,700

Median gross rent

ZIP 57421—South Dakota$946/moUnited States$1,413/mo

Owner-occupied homes

ZIP 57421100.0%South Dakota68.6%United States65.2%

Mean travel time to work

ZIP 57421—South Dakota17.8 minUnited States26.4 min

Worked from home

ZIP 5742155.6%*South Dakota9.7%United States15.1%

All figures for ZIP 57421

Each estimate has a 90% margin of error: the true value is likely within that range. * marks estimates with a large margin of error (a coefficient of variation above 30%, or ±10 percentage points or more for rates).

ZIP 57421 — ACS 2020–2024 5-year estimates
Measure	ZIP 57421	Margin of error	South Dakota	United States
Total population	75*	±90	907,428	334,922,499
Median age	16.6 yrs*	±33.8 yrs	38.0 yrs	38.9 yrs
Households	18*	±22	365,544	129,227,496
Median household income	—	—	$75,081	$80,734
Per capita income	$33,005	±$10,102	$40,550	$44,673
Poverty rate	0.0%*	±13.3 pts	11.9%	12.5%
Unemployment rate	0.0%*	±37.0 pts	2.9%	5.2%
Bachelor's degree or higher	90.9%*	±138.6 pts	31.9%	35.7%
Median home value	—	—	$257,400	$332,700
Median gross rent	—	—	$946/mo	$1,413/mo
Owner-occupied homes	100.0%	±0.0 pts	68.6%	65.2%
Mean travel time to work	—	—	17.8 min	26.4 min
Worked from home	55.6%*	±29.0 pts	9.7%	15.1%

Race and Hispanic or Latino origin

Shares of the total population by the Census Bureau's race and Hispanic or Latino origin categories (table B03002), listed in the Census Bureau's order. People self-identify on the survey.

Population by race and Hispanic or Latino origin, ZIP 57421
Group	ZIP 57421	South Dakota	United States
White alone, not Hispanic or Latino	100.0%	79.8%	57.4%
Black or African American alone, not Hispanic or Latino	0.0%	2.1%	11.9%
American Indian and Alaska Native alone, not Hispanic or Latino	0.0%	7.1%	0.5%
Asian alone, not Hispanic or Latino	0.0%	1.4%	5.9%
Native Hawaiian and Other Pacific Islander alone, not Hispanic or Latino	0.0%	0.0%	0.2%
Some other race alone, not Hispanic or Latino	0.0%	0.3%	0.6%
Two or more races, not Hispanic or Latino	0.0%	4.4%	4.3%
Hispanic or Latino (of any race)	0.0%	4.8%	19.3%

Where ZIP 57421 is

State: South Dakota
Main county: Marshall County
Land area: 33.34 sq mi· about 2 people per sq mi

County and place names come from the Census Bureau's 2020 ZCTA relationship files. A ZIP code's mailing city, set by the U.S. Postal Service, can differ from these names.

Other ZIP codes in Marshall County

57232 Marshall County, SD 57247 Marshall County, SD 57270 Marshall County, SD 57430 Marshall County, SD 57454 Marshall County, SD

See every ZIP code in South Dakota, or compare ZIP 57421 with another ZIP code.

Census figures describe residents as a group and cannot tell you about any one home or street. For a specific address, check local government and housing records.

About ZIP codes and ZCTAs: the Census Bureau publishes statistics for ZIP Code Tabulation Areas, which approximate USPS ZIP code delivery areas. Learn how they differ.

Sources

U.S. Census Bureau, American Community Survey 2020–2024 5-year estimates, detailed tables B01003, B01002, B11001, B19013, B19301, B17001, B23025, B15003, B25077, B25064, B25003, B08013, B08303, B08301, B03002 — snapshot Oct 26, 2026.
U.S. Census Bureau, 2020 ZCTA5 relationship files (county and place).
Data: U.S. Census Bureau, American Community Survey 5-year estimates (detailed tables) and 2020 Census ZCTA relationship files. This product uses the Census Bureau Data API but is not endorsed or certified by the Census Bureau. These agencies do not endorse OpenZIP.