57656 ZIP Code — Timber Lake, SD

Dewey County, South Dakota

ZIP code 57656 is located in Timber Lake, South Dakota, within Dewey County. It covers approximately 389.44 square miles and serves a population of 842 residents. This is a standard ZIP code in the Mountain (MT) timezone, served by area code 605.

About ZIP code 57656

The housing stock consists of predominantly single-family detached homes. Most homes were built in the 1970s, giving the area an established character. Median home value is $87,200. Owner-occupancy sits near the national average at 73%.

Median household income is $61,607.

The dominant occupation class is management, business, and professional, with education and healthcare as the leading industry. The average commute of 22 minutes is near the national average.

Educational attainment is near the national average, with 24% of residents holding a bachelor's degree or higher.

Health indicators show elevated rates of smoking (26%) compared to national benchmarks. 17% of residents lack health insurance, above the national average.

842
population
389.44
sq mi land
Standard
ZIP type
Mountain (MT)
timezone
57656 ZIP code map
Cities in ZIP code 57656

Below are the cities the US Postal Service accepts for ZIP code 57656. Using any city not on this list may result in mail delivery delays.

City Status
Timber Lake Preferred
Nearby ZIP codes
57657 Trail City (13.8 mi) 57625 Eagle Butte (18.4 mi) 57633 Isabel (18.8 mi)
Demographics updated 05/2026
Population
Total population 842
Population density 2 / sq mi
State FIPS 46
County FIPS 041
Geography
Land area 389.44 sq mi
Water area 1.92 sq mi
Latitude 45.3254
Longitude -100.9668
Timezone Mountain (MT)
Area code 605
Total population by age
Gender
Race & ethnicity
Economics updated 05/2026
Household income
Income range This ZIP County avg State avg
Under $50k 44.3% 56.2% 41.7%
$50k – $100k 24.5% 26.8% 33.8%
$100k – $200k 27.4% 14.6% 20.1%
Over $200k 3.8% 2.4% 4.4%

Demographics & statistics

842
Population
2
People per sq mi
32.8
Median age
$61,607
Median household income
$31,299
Per capita income
$87,200
Median home value
$500
Median monthly rent
72.5%
Home ownership
14.0%
Poverty rate
4.9%
Unemployment
282
Housing units
24.2%
Bachelor's or higher

Age distribution

Male Female
43
Under 5
43
26
5–9
27
36
10–14
37
33
15–19
33
27
20–24
28
47
25–34
48
65
35–44
66
39
45–54
39
21
55–59
22
21
60–64
21
38
65–74
38
19
75–84
19
3
85+
3
← Male
Female →

Age summary

GroupCount%
Under 1826231.1%
18 and over58068.9%
65 and over12014.3%
Median age32.8 years

Race & ethnicity

White 51.5%
American Indian / Alaska Native 42%
Two or more races 4.1%
Hispanic or Latino 0.9%
Black or African American 0.7%
Asian 0.4%
Other race 0.4%
GroupCount%
White43851.5%
American Indian / Alaska Native35742%
Two or more races354.1%
Hispanic or Latino80.9%
Black or African American60.7%
Asian30.4%
Other race30.4%

Household income

Income range This ZIP County avg State avg
Under $50k 44.3% 56.2% 41.7%
$50k – $100k 24.5% 26.8% 33.8%
$100k – $200k 27.4% 14.6% 20.1%
Over $200k 3.8% 2.4% 4.4%
Under $10k 9.8%
$10k–$15k 3.4%
$15k–$25k 4.9%
$25k–$35k 6.4%
$35k–$50k 14.7%
$50k–$75k 14.1%
$75k–$100k 15.6%
$100k–$150k 21.1%
$150k–$200k 6.1%
$200k+ 4.0%
Range% of households
Under $10k9.8%
$10k–$15k3.4%
$15k–$25k4.9%
$25k–$35k6.4%
$35k–$50k14.7%
$50k–$75k14.1%
$75k–$100k15.6%
$100k–$150k21.1%
$150k–$200k6.1%
$200k+4.0%
Median income$61,607

Housing

Home values

Under $50k 27.4%
$50k–$100k 31.6%
$100k–$150k 21.1%
$150k–$200k 3.0%
$200k–$300k 7.6%
$300k–$500k 7.6%
$500k–$1M 1.7%

Housing overview

MetricValue
Median home value$87,200
Median rent / month$500
Owner occupied72.5%
Renter occupied27.5%
Vacant12.1%
Single-family detached71.8%
Large apartment buildings0.5%
Mobile homes10.2%
Median rooms5.4
Avg household size (owned)2.73

Year built

Era%
2020 or later0.8%
2010–20193.2%
2000–20095.9%
1990–19997.8%
1980–198913.2%
1970–197919.6%
1960–196910.8%
1950–195916.4%
1940–19493.8%
1939 or earlier18.5%

Bedrooms

Size% of units
No bedroom (studio)1.1%
1 bedroom17.2%
2 bedrooms20.4%
3 bedrooms35.2%
4 bedrooms15.9%
5+ bedrooms10.2%

Vehicles per household

Vehicles% of households
No vehicle4.3%
1 vehicle30.6%
2 vehicles32.1%
3 or more33.0%

Heating fuel

Fuel type%
Utility gas0.6%
Electricity35.2%
Propane / LP gas58.7%
Fuel oil3.4%
Solar1.2%

Households & families

Household typeCount%
Married-couple family14945.6%
Cohabiting couple164.9%
Male householder, no spouse7823.9%
Female householder, no spouse8425.7%
Households with children under 1813340.7%
Households with seniors (65+)9930.3%
Average household size2.49

Marital status

StatusMaleFemale
Never married35.7%31.5%
Married49.2%50.2%
Separated1.0%0.3%
Widowed2.4%9.3%
Divorced11.8%8.7%

Education

Less than 9th grade 0.8%
Some HS, no diploma 3.9%
HS graduate 38.3%
Some college, no degree 21.4%
Associate's degree 11.4%
Bachelor's degree 14.3%
Graduate / professional 9.8%
Metric%
HS diploma or higher95.3%
Bachelor's or higher24.2%

School enrollment (ages 3–17)

TypeCount%
Nursery / preschool3917.3%
Kindergarten52.2%
Elementary school10345.6%
High school6729.6%
College / grad school125.3%

Employment

Industry of employment

Education & healthcare 37.4%
Agriculture & mining 14.0%
Public administration 12.6%
Construction 9.7%
Retail trade 7.8%
Transportation & utilities 5.6%
Arts, food & hospitality 4.0%
Other services 3.2%
Manufacturing 1.9%
Professional & management 1.6%
Information 1.3%
Finance & real estate 0.8%

Occupation

Category%
Management, business & arts48.4%
Service13.7%
Sales & office15.3%
Natural resources & construction17.2%
Production & transportation5.4%

Employment type

Type%
Private sector35.5%
Government45.7%
Self-employed18.3%
Unpaid family workers0.5%

Commute

Method%
Drive alone74.2%
Carpool4.1%
Public transit0.0%
Walk2.5%
Work from home19.2%
Other means0.0%
Avg commute (minutes)22.1

Poverty

All people 14.0%
Under 18 years 16.4%
18 and over 12.8%
Married-couple families 5.4%
Female-led households 34.8%

Income support

Source% of households
Social Security28.1%
Retirement income19.6%
Supplemental Security2.8%
Cash public assistance4.6%
Food stamps / SNAP5.8%

Health indicators

Condition%
Obesity41.0%
High blood pressure37.0%
High cholesterol32.9%
Diabetes13.5%
Heart disease9.3%
Stroke4.8%
Asthma10.6%
Arthritis28.7%
Kidney disease4.0%
Pulmonary disease9.1%
Cancer7.3%
Behavior / access%
Smoking25.6%
Binge drinking18.2%
No physical activity29.7%
Less than 7 hrs sleep31.6%
Depression16.8%
Fair or poor health18.4%
Poor mental health13.1%
Poor physical health13.1%
No health insurance14.3%
Visited doctor (checkup)76.2%
Visited dentist61.3%
Cholesterol screening87.3%
Teeth loss21.8%

Veterans & disability

VeteransCount%
Civilian veterans427.2%
Disability%
Any disability7.5%
Under 182.7%
18–64 years6.9%
65 and over20.0%

Health insurance coverage

Type%
Private insurance68.0%
Public insurance28.0%
No insurance16.6%
Uninsured under 1916.7%

Language & origin

Language spoken at home (age 5+)

LanguageCount%
English only75689.8%
Spanish40.5%
Other Indo-European10.1%
Asian & Pacific Islander00.0%
Other languages30.4%

Place of birth & citizenship

OriginCount%
Native born (US)83298.8%
Born in same state83298.8%
Born in different state61773.3%
Foreign born00.0%
Naturalized citizen101.2%
Not a US citizen220.0%

Ancestry

AncestryCount%
Arab11713.9%
Italian667.8%
Polish526.2%
AncestryCount%
English151.8%
French40.5%

Technology access

Metric% of households
Computer access38.8%
Internet access80.7%

Source: U.S. Census Bureau, American Community Survey 2025 estimates.

Frequently asked questions about ZIP code 57656

What city is ZIP code 57656 in?

ZIP code 57656 is primarily assigned to Timber Lake, South Dakota.

What county is ZIP code 57656 in?

ZIP code 57656 falls within Dewey County, South Dakota.

Is ZIP code 57656 family-oriented?

31% of residents in ZIP code 57656 are under 18, reflecting a younger, family-oriented community.

What is the typical home value in ZIP code 57656?

The median home value in ZIP code 57656 is $87,200.

What is the population of ZIP code 57656?

ZIP code 57656 has an estimated population of 842 residents, with a density of 2 people per square mile.

What is the median household income in ZIP code 57656?

The median household income in ZIP code 57656 is $61,607, below the national median of ~$75,000.

What timezone is ZIP code 57656 in?

ZIP code 57656 observes the MST timezone.

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