PlainZIP

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
$82,917
Median income
5.2%
Bachelor's or higher

The verdict

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 South Dakota average), while per-capita income is $18,478. 0.0% of residents live below the poverty line, and the unemployment rate reads 0.0%. Housing costs here run - for a typical home value, with rent averaging - a month; 86.0% of homes are owner-occupied.

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 -. Beyond these figures, 2 nearby ZIP codes within about 10 miles are surfaced below, along with 6 more sharing Kingsbury County, letting you compare 57233 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 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

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 57233?

15.4

Median Age

63.4%

Male

36.6%

Female

0.0%

Foreign-Born

White 100.0%
African American 0.0%
Asian 0.0%
American Indian or Alaska Native 0.0%
Native Hawaiian or Pacific Islander 0.0%
Two or More Ethnicities 0.0%
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?

$82,917

Median Household Income

+8% vs state

$18,478

Per Capita Income

0.0%

Poverty Rate

0.0%

Unemployment Rate

How ZIP 57233 ranks nationally

Erwin, SD household income vs. every US ZIP code

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

$82,917 Top 35% higher than 65% 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%). Below this entry. $80,000–$100,000: 5,778 US ZIPs (19%). This entry sits in this band. $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 62.9%
Bachelor's Degree or Higher 5.2%

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

What does housing look like?

71

Total Housing Units

57

Occupied Units

14

Vacant Units

6.14

Avg Household Size

Occupancy Type

Owner 86.0%
Renter 14.0%

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.

residents

What this shows Among its immediate neighbors, ZIP 57233 ranks #3 by population - useful context the national average alone can't give.

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

ZIP 57233 vs its nearest neighbors, by median income

Median household income of this ZIP and the closest reporting ZIP codes within ~10 miles.

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.

Source U.S. Census Bureau · ACS 5-Year Estimates As of 2019–2023
ZIP Code City Population Distance
57221 Bryant, SD 808 6.4 mi
57249 Lake Preston, SD 994 9.7 mi

More ZIP Codes in Kingsbury County

57212 standard
Arlington, SD
Pop: 2,062
57231 standard
De Smet, SD
Pop: 1,695
57249 standard
Lake Preston, SD
Pop: 994
57353 standard
Iroquois, SD
Pop: 829
57051 standard
Oldham, SD
Pop: 263
57214 standard
Badger, SD
Pop: 75

Related Areas

Kingsbury County Erwin, SD South Dakota

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.

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