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South Dakota ZIP Codes
Day County
Grenville, SD
57239
57239 ZIP Code — Grenville, SD
Day County, South Dakota
ZIP code 57239 is located in
Grenville ,
South Dakota ,
within Day County .
It covers approximately 44.83 square miles and serves a population of
387 residents.
This is a standard ZIP code in the Central (CT) timezone,
served by area code 605 .
About ZIP code 57239
The housing stock consists of predominantly single-family detached homes. Most homes were built in the 2000s, giving the area an established character. Median home value is $321,400. Owner-occupancy is high at 91%, well above the national average.
Median household income is $85,938. The poverty rate of 7% is below the national average. 51% of households receive Social Security income, suggesting a notable retiree or disability population.
The dominant occupation class is management, business, and professional, with retail trade as the leading industry. The average commute of 16 minutes is near the national average. Remote work is prevalent — 22% of workers work from home.
Educational attainment is near the national average, with 30% of residents holding a bachelor's degree or higher.
Notable community characteristics include a notable veteran presence at 21% of civilians, above the national average of 7%; and disability rates above the national average at 29%.
Overall, ZIP code 57239 reflects a community defined by a strong veteran community, high homeownership, a high rate of remote workers, and a significant Social Security-dependent population.
57239 ZIP code map
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Cities in ZIP code 57239
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Nearby ZIP codes
Demographics
updated 05/2026
Population
Total population
387
Population density
9 / sq mi
State FIPS
46
County FIPS
037
Geography
Land area
44.83 sq mi
Water area
2.49 sq mi
Latitude
45.5110
Longitude
-97.3477
Timezone
Central (CT)
Area code
605
Economics
updated 05/2026
Household income
Income range
This ZIP
County avg
State avg
Under $50k
47.4%
52.5%
41.7%
$50k – $100k
44.4%
30.0%
33.8%
$100k – $200k
8.3%
16.0%
20.1%
Over $200k
0.0%
1.5%
4.4%
Demographics & statistics
$85,938
Median household income
$321,400
Median home value
29.6%
Bachelor's or higher
Age distribution
Age summary
Group Count % Under 18 55 14.2% 18 and over 332 85.8% 65 and over 164 42.4% Median age 60.7 years
Race & ethnicity
Group Count % White 383 98% Hispanic or Latino 4 1% Other race 4 1%
Household income
Income range
This ZIP
County avg
State avg
Under $50k
47.4%
52.5%
41.7%
$50k – $100k
44.4%
30.0%
33.8%
$100k – $200k
8.3%
16.0%
20.1%
Over $200k
0.0%
1.5%
4.4%
Range % of households Under $10k 5.2% $10k–$15k 4.0% $15k–$25k 1.2% $25k–$35k 6.4% $35k–$50k 12.1% $50k–$75k 16.8% $75k–$100k 24.9% $100k–$150k 13.3% $150k–$200k 9.2% $200k+ 6.9% Median income $85,938
Housing
Housing overview
Metric Value Median home value $321,400 Median rent / month $0 Owner occupied 90.8% Renter occupied 9.2% Vacant 64.3% Single-family detached 95.1% Large apartment buildings 0.0% Mobile homes 4.1% Median rooms 5.1 Avg household size (owned) 2.32
Year built
Era % 2020 or later 1.0% 2010–2019 13.0% 2000–2009 24.3% 1990–1999 6.4% 1980–1989 1.6% 1970–1979 10.9% 1960–1969 6.0% 1950–1959 5.2% 1940–1949 12.2% 1939 or earlier 19.4%
Bedrooms
Size % of units No bedroom (studio) 0.0% 1 bedroom 1.0% 2 bedrooms 30.3% 3 bedrooms 38.1% 4 bedrooms 24.3% 5+ bedrooms 6.2%
Vehicles per household
Vehicles % of households No vehicle 4.0% 1 vehicle 11.0% 2 vehicles 43.9% 3 or more 41.0%
Heating fuel
Fuel type % Electricity 34.1% Propane / LP gas 62.4% Fuel oil 1.2% Wood 2.3%
Households & families
Household type Count % Married-couple family 103 59.5% Cohabiting couple 14 8.1% Male householder, no spouse 39 22.5% Female householder, no spouse 17 9.8% Households with children under 18 15 8.7% Households with seniors (65+) 100 57.8% Average household size 2.24
Marital status
Status Male Female Never married 20.5% 13.9% Married 61.5% 75.0% Separated 0.0% 0.0% Widowed 8.3% 8.3% Divorced 9.8% 2.8%
Education
Some college, no degree
8.5%
Graduate / professional
9.1%
Metric % HS diploma or higher 92.1% Bachelor's or higher 29.6%
School enrollment (ages 3–17)
Type Count % Nursery / preschool 6 12.2% Kindergarten 0 0.0% Elementary school 16 32.7% High school 17 34.7% College / grad school 10 20.4%
Employment
Industry of employment
Finance & real estate
16.1%
Education & healthcare
16.1%
Agriculture & mining
14.8%
Arts, food & hospitality
7.7%
Transportation & utilities
4.5%
Professional & management
2.6%
Public administration
0.6%
Occupation
Category % Management, business & arts 38.7% Service 6.5% Sales & office 29.0% Natural resources & construction 15.5% Production & transportation 10.3%
Employment type
Type % Private sector 58.1% Government 10.3% Self-employed 27.7% Unpaid family workers 3.9%
Commute
Method % Drive alone 66.7% Carpool 5.9% Public transit 0.0% Walk 2.0% Work from home 22.2% Other means 3.3% Avg commute (minutes) 16.4
Poverty
Married-couple families
0.0%
Female-led households
100.0%
Income support
Source % of households Social Security 50.9% Retirement income 52.6% Supplemental Security 0.0% Cash public assistance 0.0% Food stamps / SNAP 0.0%
Health indicators
Condition % Obesity 36.7% High blood pressure 40.9% High cholesterol 38.2% Diabetes 13.0% Heart disease 10.3% Stroke 4.5% Asthma 8.8% Arthritis 32.0% Kidney disease 4.0% Pulmonary disease 8.7% Cancer 9.6%
Behavior / access % Smoking 18.6% Binge drinking 15.2% No physical activity 26.5% Less than 7 hrs sleep 27.7% Depression 14.8% Fair or poor health 14.6% Poor mental health 9.5% Poor physical health 11.2% No health insurance 11.2% Visited doctor (checkup) 78.5% Visited dentist 64.8% Cholesterol screening 92.2% Teeth loss 15.0%
Veterans & disability
Veterans Count % Civilian veterans 71 21.4%
Disability % Any disability 29.2% Under 18 10.9% 18–64 years 4.8% 65 and over 60.4%
Health insurance coverage
Type % Private insurance 79.6% Public insurance 44.4% No insurance 2.8% Uninsured under 19 10.9%
Language & origin
Language spoken at home (age 5+)
Language Count % English only 380 98.2% Spanish 0 0.0% Other Indo-European 0 0.0% Asian & Pacific Islander 0 0.0% Other languages 0 0.0%
Place of birth & citizenship
Origin Count % Native born (US) 387 100.0% Born in same state 387 100.0% Born in different state 278 71.8% Foreign born 0 0.0% Naturalized citizen 0 0.0% Not a US citizen 0 0.0%
Ancestry
Ancestry Count % Polish 52 13.4% French 18 4.7% Italian 17 4.4%
Ancestry Count % German 14 3.6% Dutch 8 2.1% English 6 1.6%
Technology access
Metric % of households Computer access 44.7% Internet access 96.0%
Source: U.S. Census Bureau, American Community Survey 2025 estimates.
Frequently asked questions about ZIP code 57239
What city is ZIP code 57239 in?
ZIP code 57239 is primarily assigned to Grenville, South Dakota.
What county is ZIP code 57239 in?
ZIP code 57239 falls within Day County, South Dakota.
Does ZIP code 57239 have an older population?
42% of residents in ZIP code 57239 are 65 or older, above the national average of ~17%.
Is ZIP code 57239 mostly owner-occupied?
91% of occupied units in ZIP code 57239 are owner-occupied, well above the national average.
Does ZIP code 57239 have a large retiree population?
51% of households in ZIP code 57239 receive Social Security income, suggesting a significant retiree or disability population.
Does ZIP code 57239 have a large veteran population?
21% of civilians in ZIP code 57239 are veterans, above the national average of ~7%.
What timezone is ZIP code 57239 in?
ZIP code 57239 observes the CST timezone.
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