57750 ZIP Code — Interior, SD

Jackson County, South Dakota

ZIP code 57750 is located in Interior, South Dakota, within Jackson County. It covers approximately 325.24 square miles and serves a population of 197 residents. This is a standard ZIP code in the Mountain (MT) timezone, served by area code 605.

197

population

325.24

sq mi land

Standard

ZIP type

Mountain (MT)

timezone

57750 ZIP code map

Cities in ZIP code 57750

Below are the cities the US Postal Service accepts for ZIP code 57750. Using any city not on this list may result in mail delivery delays.

City	Status
Interior	Acceptable
Interior	Acceptable

Demographics updated 06/2026

Population
Total population	197
Population density	1 / sq mi
State FIPS	46
County FIPS	071

Geography
Land area	325.24 sq mi
Water area	0.83 sq mi
Latitude	43.7527
Longitude	-101.8982
Timezone	Mountain (MT)
Area code	605

Total population by age

Gender

Race & ethnicity

Economics updated 06/2026

Household income

Income range	This ZIP	County avg	State avg
Under $50k	77.6%	74.4%	41.7%
$50k – $100k	22.4%	21.6%	33.8%
$100k – $200k	0.0%	4.0%	20.1%
Over $200k	0.0%	0.0%	4.4%

Demographics & statistics

197

Population

People per sq mi

32.3

Median age

$16,875

Median household income

$11,243

Per capita income

$196,900

Median home value

$923

Median monthly rent

44.0%

Home ownership

67.0%

Poverty rate

0.0%

Unemployment

Housing units

12.7%

Bachelor's or higher

Age distribution

Male Female

Under 5

5–9

10–14

15–19

20–24

25–34

45–54

55–59

60–64

65–74

75–84

← Male

Female →

Age summary

Group	Count	%
Under 18	58	29.4%
18 and over	139	70.6%
65 and over	24	12.2%
Median age	32.3 years

Race & ethnicity

American Indian / Alaska Native 59.4%

White 40.6%

Group	Count	%
American Indian / Alaska Native	117	59.4%
White	80	40.6%

Household income

Income range	This ZIP	County avg	State avg
Under $50k	77.6%	74.4%	41.7%
$50k – $100k	22.4%	21.6%	33.8%
$100k – $200k	0.0%	4.0%	20.1%
Over $200k	0.0%	0.0%	4.4%

Under $10k 42.9%

$15k–$25k 21.4%

$25k–$35k 13.1%

$35k–$50k 4.8%

$50k–$75k 16.7%

$75k–$100k 1.2%

Range	% of households
Under $10k	42.9%
$15k–$25k	21.4%
$25k–$35k	13.1%
$35k–$50k	4.8%
$50k–$75k	16.7%
$75k–$100k	1.2%
Median income	$16,875

Housing

Home values

Under $50k 8.1%

$50k–$100k 2.7%

$100k–$150k 29.7%

$150k–$200k 10.8%

$200k–$300k 16.2%

$300k–$500k 32.4%

Housing overview

Metric	Value
Median home value	$196,900
Median rent / month	$923
Owner occupied	44.0%
Renter occupied	56.0%
Vacant	32.8%
Single-family detached	73.6%
Large apartment buildings	0.0%
Mobile homes	14.4%
Median rooms	5.4
Avg household size (owned)	1.78

Year built

Era	%
2020 or later	0.0%
2010–2019	0.8%
2000–2009	19.2%
1990–1999	5.6%
1980–1989	18.4%
1970–1979	9.6%
1960–1969	0.0%
1950–1959	15.2%
1940–1949	2.4%
1939 or earlier	28.8%

Bedrooms

Size	% of units
No bedroom (studio)	0.0%
1 bedroom	0.8%
2 bedrooms	44.8%
3 bedrooms	23.2%
4 bedrooms	31.2%
5+ bedrooms	0.0%

Vehicles per household

Vehicles	% of households
No vehicle	28.6%
1 vehicle	32.1%
2 vehicles	26.2%
3 or more	13.1%

Heating fuel

Fuel type	%
Electricity	10.7%
Propane / LP gas	35.7%
Fuel oil	33.3%
Wood	20.2%

Households & families

Household type	Count	%
Married-couple family	24	28.6%
Cohabiting couple	34	40.5%
Male householder, no spouse	8	9.5%
Female householder, no spouse	18	21.4%
Households with children under 18	42	50.0%
Households with seniors (65+)	14	16.7%
Average household size	2.35

Marital status

Status	Male	Female
Never married	45.9%	56.4%
Married	45.9%	26.9%
Separated	0.0%	0.0%
Widowed	0.0%	7.7%
Divorced	8.2%	9.0%

Education

Less than 9th grade 0.0%

Some HS, no diploma 34.5%

HS graduate 33.6%

Some college, no degree 13.6%

Associate's degree 5.5%

Bachelor's degree 4.5%

Graduate / professional 8.2%

Metric	%
HS diploma or higher	65.5%
Bachelor's or higher	12.7%

School enrollment (ages 3–17)

Type	Count	%
Nursery / preschool	0	0.0%
Kindergarten	0	0.0%
Elementary school	25	100.0%
High school	0	0.0%
College / grad school	0	0.0%

Employment

Industry of employment

Arts, food & hospitality 33.3%

Education & healthcare 27.5%

Retail trade 15.7%

Wholesale trade 13.7%

Agriculture & mining 9.8%

Occupation

Category	%
Management, business & arts	31.4%
Service	52.9%
Sales & office	2.0%
Natural resources & construction	0.0%
Production & transportation	13.7%

Employment type

Type	%
Private sector	66.7%
Government	27.5%
Self-employed	0.0%
Unpaid family workers	5.9%

Commute

Method	%
Drive alone	52.9%
Carpool	0.0%
Public transit	0.0%
Walk	15.7%
Work from home	31.4%
Other means	0.0%
Avg commute (minutes)	24.0

Poverty

All people 67.0%

Under 18 years 100.0%

18 and over 53.2%

Married-couple families 33.3%

Female-led households 100.0%

Income support

Source	% of households
Social Security	16.7%
Retirement income	3.6%
Supplemental Security	9.5%
Cash public assistance	9.5%
Food stamps / SNAP	50.0%

Health indicators

Condition	%
Obesity	38.3%
High blood pressure	39.0%
High cholesterol	33.6%
Diabetes	15.0%
Heart disease	9.3%
Stroke	5.2%
Asthma	12.2%
Arthritis	28.3%
Kidney disease	4.3%
Pulmonary disease	10.7%
Cancer	6.6%

Behavior / access	%
Smoking	29.9%
Binge drinking	18.5%
No physical activity	29.9%
Less than 7 hrs sleep	32.7%
Depression	17.7%
Fair or poor health	21.9%
Poor mental health	14.9%
Poor physical health	14.9%
No health insurance	15.3%
Visited doctor (checkup)	75.9%
Visited dentist	52.6%
Cholesterol screening	85.3%
Teeth loss	23.6%

Veterans & disability

Veterans	Count	%
Civilian veterans	7	5.0%

Disability	%
Any disability	6.6%
Under 18	0.0%
18–64 years	6.1%
65 and over	25.0%

Health insurance coverage

Type	%
Private insurance	19.8%
Public insurance	73.6%
No insurance	16.2%
Uninsured under 19	0.0%

Language & origin

Language spoken at home (age 5+)

Language	Count	%
English only	172	87.3%
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)	197	100.0%
Born in same state	197	100.0%
Born in different state	143	72.6%
Foreign born	0	0.0%
Naturalized citizen	0	0.0%
Not a US citizen	0	0.0%

Ancestry

Ancestry	Count	%
Italian	21	10.7%
French	11	5.6%

Ancestry	Count	%
Polish	6	3%

Technology access

Metric	% of households
Computer access	42.6%
Internet access	86.9%

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

Frequently asked questions about ZIP code 57750

What city is ZIP code 57750 in?

ZIP code 57750 is primarily assigned to Interior, South Dakota.

What county is ZIP code 57750 in?

ZIP code 57750 falls within Jackson County, South Dakota.

What is the poverty rate in ZIP code 57750?

67% of residents in ZIP code 57750 live below the poverty line, above the national average.

Is ZIP code 57750 mostly rentals?

56% of occupied units in ZIP code 57750 are renter-occupied.

How educated is the population of ZIP code 57750?

13% of residents hold a bachelor's degree or higher — below the national average of ~33%, consistent with a trades-oriented local economy.

What is the median household income in ZIP code 57750?

The median household income in ZIP code 57750 is $16,875, below the national median of ~$75,000.

What timezone is ZIP code 57750 in?

ZIP code 57750 observes the MST timezone.