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South Dakota ZIP Codes
Dewey County
Isabel, SD
57633
57633 ZIP Code — Isabel, SD
Dewey County, South Dakota
ZIP code 57633 is located in
Isabel ,
South Dakota ,
within Dewey County .
It covers approximately 812.64 square miles and serves a population of
402 residents.
This is a standard ZIP code in the Mountain (MT) timezone,
served by area code 605 .
About ZIP code 57633
The housing stock consists of predominantly single-family detached homes. Most homes were built in the 1960s, giving the area an established character. Median home value is $71,700. Owner-occupancy sits near the national average at 75%.
The gap between median ($71,250) and mean household income suggests income inequality — a small number of higher earners pull the average up. The poverty rate of 7% is below the national average.
The dominant occupation class is management, business, and professional, with education and healthcare as the leading industry. The average commute of 19 minutes is near the national average. Remote work is prevalent — 24% of workers work from home.
College attainment at 20% is below the national average, consistent with a trades and production-oriented local economy.
Health indicators show elevated rates of smoking (25%) compared to national benchmarks.
Overall, ZIP code 57633 reflects a community defined by a trades-oriented workforce and a high rate of remote workers.
57633 ZIP code map
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Cities in ZIP code 57633
Below are the cities the US Postal Service accepts for ZIP code 57633. Using any city not on this list may result in mail delivery delays.
Nearby ZIP codes
Demographics
updated 05/2026
Population
Total population
402
Population density
0 / sq mi
State FIPS
46
County FIPS
041
Geography
Land area
812.64 sq mi
Water area
2.72 sq mi
Latitude
45.2331
Longitude
-101.3297
Timezone
Mountain (MT)
Area code
605
Economics
updated 05/2026
Household income
Income range
This ZIP
County avg
State avg
Under $50k
32.7%
56.2%
41.7%
$50k – $100k
42.1%
26.8%
33.8%
$100k – $200k
22.2%
14.6%
20.1%
Over $200k
2.9%
2.4%
4.4%
Demographics & statistics
$71,250
Median household income
19.7%
Bachelor's or higher
Age distribution
Age summary
Group Count % Under 18 98 24.4% 18 and over 304 75.6% 65 and over 58 14.4% Median age 38.2 years
Race & ethnicity
American Indian / Alaska Native
19.2%
Group Count % White 322 80.1% American Indian / Alaska Native 77 19.2% Two or more races 3 0.7%
Household income
Income range
This ZIP
County avg
State avg
Under $50k
32.7%
56.2%
41.7%
$50k – $100k
42.1%
26.8%
33.8%
$100k – $200k
22.2%
14.6%
20.1%
Over $200k
2.9%
2.4%
4.4%
Range % of households Under $10k 4.5% $10k–$15k 1.1% $15k–$25k 2.8% $25k–$35k 4.0% $35k–$50k 14.2% $50k–$75k 28.4% $75k–$100k 14.8% $100k–$150k 6.3% $150k–$200k 8.0% $200k+ 15.9% Median income $71,250
Housing
Housing overview
Metric Value Median home value $71,700 Median rent / month $738 Owner occupied 75.0% Renter occupied 25.0% Vacant 17.0% Single-family detached 81.6% Large apartment buildings 0.0% Mobile homes 18.4% Median rooms 6.2 Avg household size (owned) 2.49
Year built
Era % 2020 or later 0.0% 2010–2019 3.8% 2000–2009 1.9% 1990–1999 9.0% 1980–1989 7.5% 1970–1979 16.5% 1960–1969 29.2% 1950–1959 5.7% 1940–1949 1.9% 1939 or earlier 24.5%
Bedrooms
Size % of units No bedroom (studio) 0.0% 1 bedroom 1.9% 2 bedrooms 24.5% 3 bedrooms 33.5% 4 bedrooms 22.6% 5+ bedrooms 17.5%
Vehicles per household
Vehicles % of households No vehicle 1.7% 1 vehicle 31.3% 2 vehicles 29.0% 3 or more 38.1%
Heating fuel
Fuel type % Electricity 12.5% Propane / LP gas 75.6% Fuel oil 10.2% Wood 0.6%
Households & families
Household type Count % Married-couple family 98 55.7% Cohabiting couple 6 3.4% Male householder, no spouse 39 22.2% Female householder, no spouse 33 18.8% Households with children under 18 60 34.1% Households with seniors (65+) 37 21.0% Average household size 2.28
Marital status
Status Male Female Never married 25.7% 26.8% Married 58.7% 54.4% Separated 0.0% 0.0% Widowed 0.0% 11.4% Divorced 15.6% 7.4%
Education
Some college, no degree
24.1%
Graduate / professional
8.4%
Metric % HS diploma or higher 90.9% Bachelor's or higher 19.7%
School enrollment (ages 3–17)
Type Count % Nursery / preschool 2 2.2% Kindergarten 5 5.4% Elementary school 51 54.8% High school 22 23.7% College / grad school 13 14.0%
Employment
Industry of employment
Education & healthcare
30.2%
Agriculture & mining
23.4%
Public administration
6.3%
Transportation & utilities
3.2%
Arts, food & hospitality
2.7%
Occupation
Category % Management, business & arts 50.0% Service 5.4% Sales & office 18.9% Natural resources & construction 21.2% Production & transportation 4.5%
Employment type
Type % Private sector 43.7% Government 30.2% Self-employed 22.5% Unpaid family workers 3.6%
Commute
Method % Drive alone 70.3% Carpool 4.1% Public transit 0.0% Walk 1.4% Work from home 24.2% Other means 0.0% Avg commute (minutes) 19.1
Poverty
Married-couple families
2.0%
Female-led households
13.3%
Income support
Source % of households Social Security 23.3% Retirement income 12.5% Supplemental Security 4.5% Cash public assistance 5.7% Food stamps / SNAP 4.0%
Health indicators
Condition % Obesity 39.9% High blood pressure 38.2% High cholesterol 33.8% Diabetes 13.8% Heart disease 10.4% Stroke 5.2% Asthma 10.5% Arthritis 30.4% Kidney disease 4.4% Pulmonary disease 10.2% Cancer 7.9%
Behavior / access % Smoking 25.0% Binge drinking 17.0% No physical activity 31.5% Less than 7 hrs sleep 30.1% Depression 16.7% Fair or poor health 19.6% Poor mental health 12.7% Poor physical health 13.8% No health insurance 14.7% Visited doctor (checkup) 76.7% Visited dentist 58.6% Cholesterol screening 86.9% Teeth loss 23.1%
Veterans & disability
Veterans Count % Civilian veterans 14 4.6%
Disability % Any disability 12.4% Under 18 0.0% 18–64 years 11.4% 65 and over 37.9%
Health insurance coverage
Type % Private insurance 69.9% Public insurance 31.1% No insurance 13.9% Uninsured under 19 16.3%
Language & origin
Language spoken at home (age 5+)
Language Count % English only 379 94.3% Spanish 2 0.5% Other Indo-European 0 0.0% Asian & Pacific Islander 2 0.5% Other languages 0 0.0%
Place of birth & citizenship
Origin Count % Native born (US) 402 100.0% Born in same state 402 100.0% Born in different state 283 70.4% Foreign born 0 0.0% Naturalized citizen 0 0.0% Not a US citizen 0 0.0%
Ancestry
Ancestry Count % Italian 66 16.4% Arab 53 13.2% Polish 46 11.4% French 17 4.2%
Ancestry Count % Dutch 6 1.5% Irish 4 1% English 1 0.2%
Technology access
Metric % of households Computer access 43.8% Internet access 90.3%
Source: U.S. Census Bureau, American Community Survey 2025 estimates.
Frequently asked questions about ZIP code 57633
What city is ZIP code 57633 in?
ZIP code 57633 is primarily assigned to Isabel, South Dakota.
What county is ZIP code 57633 in?
ZIP code 57633 falls within Corson County, South Dakota.
What is the typical home value in ZIP code 57633?
The median home value in ZIP code 57633 is $71,700.
What is the population of ZIP code 57633?
ZIP code 57633 has an estimated population of 402 residents.
What is the median household income in ZIP code 57633?
The median household income in ZIP code 57633 is $71,250, below the national median of ~$75,000.
What timezone is ZIP code 57633 in?
ZIP code 57633 observes the MST timezone.
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