57639 ZIP Code — Little Eagle, SD

Corson County, South Dakota

ZIP code 57639 is located in Little Eagle, South Dakota, within Corson County. It covers approximately 1.98 square miles and serves a population of 355 residents. This is a standard ZIP code in the Mountain (MT) timezone, served by area code 605.

About ZIP code 57639

The housing stock consists of predominantly single-family detached homes. Most homes were built in the 1980s, giving the area an established character. Renters make up the majority at 88%, typical of denser urban areas.

Median household income is $18,125. Poverty affects 88% of residents, above the national average. SNAP benefit usage at 72% of households reflects economic stress in the area.

The dominant occupation class is service, with professional and management as the leading industry.

Health indicators show elevated rates of smoking (36%) compared to national benchmarks. 18% of residents lack health insurance, above the national average.

Overall, ZIP code 57639 reflects a community defined by economic challenges above the national average and elevated reliance on food assistance.

355

population

1.98

sq mi land

Standard

ZIP type

Mountain (MT)

timezone

57639 ZIP code map

Cities in ZIP code 57639

Below are the cities the US Postal Service accepts for ZIP code 57639. Using any city not on this list may result in mail delivery delays.

City	Status
Little Eagle	Acceptable

Demographics updated 05/2026

Population
Total population	355
Population density	179 / sq mi
State FIPS	46
County FIPS	031

Geography
Land area	1.98 sq mi
Water area	0.12 sq mi
Latitude	45.6755
Longitude	-100.8036
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	95.0%	61.0%	41.7%
$50k – $100k	5.0%	23.8%	33.8%
$100k – $200k	0.0%	12.9%	20.1%
Over $200k	0.0%	2.3%	4.4%

Demographics & statistics

355

Population

179

People per sq mi

21.5

Median age

$18,125

Median household income

$4,474

Per capita income

Median home value

$244

Median monthly rent

12.2%

Home ownership

87.9%

Poverty rate

65.9%

Unemployment

Housing units

0.0%

Bachelor's or higher

Age distribution

Male Female

Under 5

5–9

10–14

15–19

20–24

25–34

35–44

45–54

55–59

60–64

65–74

← Male

Female →

Age summary

Group	Count	%
Under 18	158	44.5%
18 and over	197	55.5%
65 and over	11	3.1%
Median age	21.5 years

Race & ethnicity

American Indian / Alaska Native 98.9%

White 1.1%

Group	Count	%
American Indian / Alaska Native	351	98.9%
White	4	1.1%

Household income

Income range	This ZIP	County avg	State avg
Under $50k	95.0%	61.0%	41.7%
$50k – $100k	5.0%	23.8%	33.8%
$100k – $200k	0.0%	12.9%	20.1%
Over $200k	0.0%	2.3%	4.4%

Under $10k 21.6%

$10k–$15k 25.7%

$15k–$25k 24.3%

$25k–$35k 21.6%

$35k–$50k 1.4%

$50k–$75k 5.4%

Range	% of households
Under $10k	21.6%
$10k–$15k	25.7%
$15k–$25k	24.3%
$25k–$35k	21.6%
$35k–$50k	1.4%
$50k–$75k	5.4%
Median income	$18,125

Housing

Home values

Under $50k 55.6%

$100k–$150k 44.4%

Housing overview

Metric	Value
Median home value	$0
Median rent / month	$244
Owner occupied	12.2%
Renter occupied	87.8%
Vacant	12.9%
Single-family detached	94.1%
Large apartment buildings	0.0%
Mobile homes	5.9%
Median rooms	5.0
Avg household size (owned)	6.11

Year built

Era	%
2020 or later	0.0%
2010–2019	4.7%
2000–2009	16.5%
1990–1999	12.9%
1980–1989	40.0%
1970–1979	8.2%
1960–1969	17.6%
1950–1959	0.0%
1940–1949	0.0%
1939 or earlier	0.0%

Bedrooms

Size	% of units
No bedroom (studio)	0.0%
1 bedroom	3.5%
2 bedrooms	21.2%
3 bedrooms	57.6%
4 bedrooms	14.1%
5+ bedrooms	3.5%

Vehicles per household

Vehicles	% of households
No vehicle	20.3%
1 vehicle	59.5%
2 vehicles	13.5%
3 or more	6.8%

Heating fuel

Fuel type	%
Electricity	5.4%
Propane / LP gas	94.6%

Households & families

Household type	Count	%
Married-couple family	23	31.1%
Cohabiting couple	7	9.5%
Male householder, no spouse	25	33.8%
Female householder, no spouse	19	25.7%
Households with children under 18	44	59.5%
Households with seniors (65+)	11	14.9%
Average household size	4.80

Marital status

Status	Male	Female
Never married	46.4%	69.2%
Married	23.7%	23.9%
Separated	0.0%	6.8%
Widowed	10.3%	0.0%
Divorced	19.6%	0.0%

Education

Less than 9th grade 1.9%

Some HS, no diploma 25.8%

HS graduate 52.2%

Some college, no degree 13.8%

Associate's degree 6.3%

Bachelor's degree 0.0%

Graduate / professional 0.0%

Metric	%
HS diploma or higher	72.3%
Bachelor's or higher	0.0%

School enrollment (ages 3–17)

Type	Count	%
Nursery / preschool	16	15.5%
Kindergarten	0	0.0%
Elementary school	47	45.6%
High school	33	32.0%
College / grad school	7	6.8%

Employment

Industry of employment

Professional & management 35.7%

Retail trade 25.0%

Education & healthcare 25.0%

Construction 14.3%

Occupation

Category	%
Management, business & arts	14.3%
Service	46.4%
Sales & office	0.0%
Natural resources & construction	14.3%
Production & transportation	25.0%

Employment type

Type	%
Private sector	35.7%
Government	50.0%
Self-employed	14.3%
Unpaid family workers	0.0%

Commute

Method	%
Drive alone	85.7%
Carpool	0.0%
Public transit	0.0%
Walk	0.0%
Work from home	14.3%
Other means	0.0%
Avg commute (minutes)	0.0

Poverty

All people 87.9%

Under 18 years 95.6%

18 and over 81.7%

Married-couple families 82.6%

Female-led households 100.0%

Income support

Source	% of households
Social Security	18.9%
Retirement income	27.0%
Supplemental Security	17.6%
Cash public assistance	54.1%
Food stamps / SNAP	71.6%

Health indicators

Condition	%
Obesity	43.9%
High blood pressure	29.3%
High cholesterol	23.5%
Diabetes	13.3%
Heart disease	6.4%
Stroke	4.2%
Asthma	13.8%
Arthritis	19.7%
Kidney disease	3.3%
Pulmonary disease	8.0%
Cancer	3.7%

Behavior / access	%
Smoking	36.0%
Binge drinking	20.9%
No physical activity	33.5%
Less than 7 hrs sleep	34.8%
Depression	19.3%
Fair or poor health	23.1%
Poor mental health	17.9%
Poor physical health	14.4%
No health insurance	17.0%
Visited doctor (checkup)	74.1%
Visited dentist	48.0%
Cholesterol screening	80.3%
Teeth loss	28.9%

Veterans & disability

Veterans	Count	%
Civilian veterans	19	9.6%

Disability	%
Any disability	11.0%
Under 18	0.0%
18–64 years	21.0%
65 and over	0.0%

Health insurance coverage

Type	%
Private insurance	7.0%
Public insurance	75.2%
No insurance	17.7%
Uninsured under 19	2.4%

Language & origin

Language spoken at home (age 5+)

Language	Count	%
English only	276	77.7%
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)	355	100.0%
Born in same state	355	100.0%
Born in different state	65	18.3%
Foreign born	0	0.0%
Naturalized citizen	0	0.0%
Not a US citizen	0	0.0%

Ancestry

Ancestry	Count	%
Italian	4	1.1%

Ancestry	Count	%
Arab	4	1.1%

Technology access

Metric	% of households
Computer access	20.8%
Internet access	48.6%

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

Frequently asked questions about ZIP code 57639

What city is ZIP code 57639 in?

ZIP code 57639 is primarily assigned to Little Eagle, South Dakota.

What county is ZIP code 57639 in?

ZIP code 57639 falls within Corson County, South Dakota.

What is the poverty rate in ZIP code 57639?

88% of residents in ZIP code 57639 live below the poverty line, above the national average.

Is ZIP code 57639 mostly rentals?

88% of occupied units in ZIP code 57639 are renter-occupied.

Is ZIP code 57639 family-oriented?

45% of residents in ZIP code 57639 are under 18, reflecting a younger, family-oriented community.

What is the median household income in ZIP code 57639?

The median household income in ZIP code 57639 is $18,125, below the national median of ~$75,000.

What timezone is ZIP code 57639 in?

ZIP code 57639 observes the MST timezone.