Amherst, SD · standard
ZIP Code 57421
Marshall County, South Dakota - Census ACS demographics, housing tenure, and business patterns, benchmarked against every US ZIP.
- 88
- 1/sq mi
- 90.9%
- Bachelor's or higher
ZIP code 57421 is a sparsely populated ZIP (a standard USPS delivery area) in Amherst, Marshall County, South Dakota, home to just 88 residents across 97.8 square miles, a density of 1 people per square mile, in the Chicago time zone.
Median household income is not on file for ZIP 57421, but per-capita income is $33,005. The poverty rate stands at 0.0% and the unemployment rate at 0.0%. Median home value sits at -, median rent at - a month, and owner-occupancy at 100.0%.
This is a highly-educated ZIP: 90.9% of adults hold a bachelor's degree or higher, the median age is 16.6, and the average commute is -. Beyond these figures, 2 nearby ZIP codes within about 10 miles are surfaced below, along with 5 more sharing Marshall County, letting you compare 57421 to its immediate surroundings rather than a national baseline alone.
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 57421, Amherst, 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
88
Population
97.8
Area (sq mi)
1
People / sq mi
Chicago
Time Zone
standard
ZIP Type
Who lives in ZIP 57421?
16.6
Median Age
40.0%
Male
60.0%
Female
0.0%
Foreign-Born
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?
$33,005
Per Capita Income
0.0%
Poverty Rate
0.0%
Unemployment Rate
Source: U.S. Census Bureau, ACS 5-Year Estimates (2023)
What is the education profile here?
Source: U.S. Census Bureau, ACS 5-Year Estimates (2023)
What does housing look like?
26
Total Housing Units
18
Occupied Units
8
Vacant Units
4.17
Avg Household Size
Occupancy Type
1943
Median Year Built
Source: U.S. Census Bureau, ACS 5-Year Estimates (2023)
Nearby ZIP Codes
Want a side-by-side? Compare 57421 vs 57432 →
ZIP 57421 vs its nearest neighbors, by population
Resident population of this ZIP and the closest reporting ZIP codes within ~10 miles.
- 57454
Langford (57454)
558 residents
- 57432
Claremont (57432)
465 residents
- 57421 88
Amherst (57421)
88 residents
What this shows Among its immediate neighbors, ZIP 57421 ranks #3 by population - useful context the national average alone can't give.
More ZIP Codes in Marshall County
Related Areas
Frequently Asked Questions
What county is ZIP code 57421 in? ▼
What is the population of ZIP code 57421? ▼
What is the demographic makeup of ZIP 57421? ▼
What is the education level in ZIP code 57421? ▼
Read our methodology to see how this data is sourced, computed, and verified.