Erwin, SD · standard
ZIP Code 57233
Kingsbury County, South Dakota - Census ACS demographics, housing tenure, and business patterns, benchmarked against every US ZIP.
- 118
- 1/sq mi Low-density area
- $82,917
- Median income Near-median income area
- 5.2%
- Bachelor's or higher Below-average bachelor's attainment
National ZIP placement
Erwin pairs an above-median household income, in a rural, homeowner-dominated area.
- Top 35%
- household income, US ZIPs
- 1
- people per sq mi
- 86%
- owner-occupied homes
Source: U.S. Census Bureau ACS 5-Year Estimates (2019–2023). Percentiles rank ZIP 57233 against every reporting US ZIP.
ZIP code 57233 is a sparsely populated ZIP (a standard USPS delivery area) in Erwin, Kingsbury County, South Dakota, home to just 118 residents across 90.8 square miles, a density of 1 people per square mile, in the Chicago time zone.
ZIP 57233 lands in the middle-income range, with a median household income of $82,917 (8% above the average South Dakota ZIP), while per-capita income is $18,478. Both reported hardship measures are comparatively low in absolute terms: poverty is 0.0% and unemployment is 0.0%. The ACS does not report a median home value for this ZIP, so housing cost context is limited to the available tenure and rent fields.
Formal educational attainment runs low here: just 5.2% of adults hold a bachelor's degree or higher, the median age is 15.4, and the average commute is -. The page also surfaces 2 ZIP codes within roughly 10 miles and 6 more in Kingsbury County, so 57233 can be compared with both its immediate and county-level context.
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 57233, Erwin, 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
118
Population
90.8
Area (sq mi)
1
People / sq mi
Chicago
Time Zone
standard
ZIP Type
Who lives in ZIP 57233?
15.4
Median Age
63.4%
Male
36.6%
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?
$82,917
Median Household Income
+8% vs state ZIP avg
$18,478
Per Capita Income
0.0%
Poverty Rate
0.0%
Unemployment Rate
How ZIP 57233 ranks among South Dakota ZIPs
Erwin, SD household income vs. every South Dakota ZIP code
Median household income among 337 reporting South Dakota ZIPs (this ZIP's population is too small for a reliable national-corpus placement)
$82,917 Top 35% higher than 65% of 337 South Dakota ZIPs
Each bar is a $20K-wide band; taller bars hold more South Dakota 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?
Source: U.S. Census Bureau, ACS 5-Year Estimates (2023)
What does housing look like?
Housing stock: occupied vs vacant
71housing units
71
Total Housing Units
57
Occupied Units
14
Vacant Units
6.14
Avg Household Size
Occupancy Type
1938
Median Year Built
Source: U.S. Census Bureau, ACS 5-Year Estimates (2023)
Nearby ZIP Codes
Want a side-by-side? Compare 57233 vs 57221 →
ZIP 57233 vs its nearest neighbors, by population
Resident population of this ZIP and the closest reporting ZIP codes within ~10 miles.
- 57249
Lake Preston (57249)
994 residents
- 57221
Bryant (57221)
808 residents
- 57233 118
Erwin (57233)
118 residents
What this shows Among its immediate neighbors, ZIP 57233 ranks #3 by population - useful context the national average alone can't give.
ZIP 57233 vs its nearest neighbors, by median income
Median household income of this ZIP and the closest reporting ZIP codes within ~10 miles.
- 57233
Erwin (57233)
$82,917 median income
- 57221
Bryant (57221)
$73,988 median income
- 57249
Lake Preston (57249)
$63,182 median income
What this shows By household income, ZIP 57233 ranks the highest of 3 neighboring ZIPs, local affluence varies block to block, not just metro to metro.
Nationwide ZIPs with similar ACS profiles
Two Census-derived peer sets for ZIP 57233, both outside SD so the neighborhoods are not geographic containment (Nearby and same-county blocks stay local).
Similar median household income
Nearest cross-state ZIPs by ACS median household income.
More ZIP Codes in Kingsbury County
Related Areas
Frequently Asked Questions
What county is ZIP code 57233 in?
ZIP code 57233 (Erwin) is located in Kingsbury County, South Dakota. Kingsbury County contains multiple ZIP codes, see the full list at /counties/kingsbury-sd.
What is the population of ZIP code 57233?
ZIP code 57233 in Erwin, SD has a population of 118 according to the Census Bureau ACS 2023 estimates.
What is the median household income in ZIP 57233?
The median household income in ZIP 57233 is $82,917, which is 9% above the national average of $76,288.
What is the demographic makeup of ZIP 57233?
The largest racial group in ZIP 57233 is White at 100.0%.
What is the education level in ZIP code 57233?
In ZIP code 57233, 62.9% of residents aged 25+ have a high school diploma or higher, and 5.2% 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 57233?
In ZIP code 57233, approximately 86.0% of occupied housing units are owner-occupied and 14.0% are renter-occupied, based on Census ACS 2023 data.
Related
Take this with you
What to do with ZIP 57233's numbers, next.
- See how ZIP 57233 compares to a neighboring ZIP code on the same Census fields Compare this ZIP
- Check where Erwin, SD ranks among every U.S. ZIP code on income, education, or homeownership View national rankings
- Save this ZIP to your shortlist to track alongside others you're considering View your shortlist
ZIP Code Tabulation Areas (ZCTAs) are Census Bureau approximations of USPS ZIP codes; figures describe the ZCTA area, not any single address within it.