57730 ZIP Code — Custer, SD

Custer County, South Dakota

ZIP code 57730 is located in Custer, South Dakota, within Custer County. It covers approximately 516.16 square miles and serves a population of 5,809 residents. This is a standard ZIP code in the Mountain (MT) timezone, served by area code 605.

About ZIP code 57730

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 $286,300. Owner-occupancy is high at 81%, well above the national average.

Median household income is $76,667. 51% of households receive Social Security income, suggesting a notable retiree or disability population.

The dominant occupation class is management, business, and professional, with education and healthcare as the leading industry. The average commute of 29 minutes is near the national average.

Educational attainment is near the national average, with 34% of residents holding a bachelor's degree or higher.

Notable community characteristics include a notable veteran presence at 15% of civilians, above the national average of 7%.

Overall, ZIP code 57730 reflects a community defined by a strong veteran community, high homeownership, and a significant Social Security-dependent population.

5,809

population

516.16

sq mi land

Standard

ZIP type

Mountain (MT)

timezone

57730 ZIP code map

Cities in ZIP code 57730

Below are the cities the US Postal Service accepts for ZIP code 57730. Using any city not on this list may result in mail delivery delays.

City	Status
Custer	Acceptable
Custer	Acceptable
Custer	Preferred

Nearby ZIP codes

57751 Keystone (19.9 mi)

Demographics updated 05/2026

Population
Total population	5,809
Population density	11 / sq mi
State FIPS	46
County FIPS	033

Geography
Land area	516.16 sq mi
Water area	0.61 sq mi
Latitude	43.7084
Longitude	-103.7452
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	36.9%	37.6%	41.7%
$50k – $100k	35.5%	34.7%	33.8%
$100k – $200k	25.0%	25.3%	20.1%
Over $200k	2.6%	2.4%	4.4%

Demographics & statistics

5,809

Population

People per sq mi

57.0

Median age

$76,667

Median household income

$41,027

Per capita income

$286,300

Median home value

$954

Median monthly rent

81.0%

Home ownership

10.1%

Poverty rate

2.7%

Unemployment

2,825

Housing units

33.9%

Bachelor's or higher

Age distribution

Male Female

104

Under 5

115

133

5–9

149

10–14

112

15–19

124

107

20–24

119

265

25–34

296

228

35–44

253

314

45–54

350

186

55–59

207

341

60–64

380

564

65–74

629

249

75–84

278

85+

← Male

Female →

Age summary

Group	Count	%
Under 18	816	14.0%
18 and over	4,993	86.0%
65 and over	1,861	32.0%
Median age	57.0 years

Race & ethnicity

White 91.9%

Two or more races 4%

American Indian / Alaska Native 2.5%

Asian 0.5%

Black or African American 0.4%

Hispanic or Latino 0.4%

Other race 0.3%

Group	Count	%
White	5,357	91.9%
Two or more races	235	4%
American Indian / Alaska Native	148	2.5%
Asian	28	0.5%
Black or African American	23	0.4%
Hispanic or Latino	22	0.4%
Other race	18	0.3%

Household income

Income range	This ZIP	County avg	State avg
Under $50k	36.9%	37.6%	41.7%
$50k – $100k	35.5%	34.7%	33.8%
$100k – $200k	25.0%	25.3%	20.1%
Over $200k	2.6%	2.4%	4.4%

Under $10k 3.7%

$10k–$15k 4.7%

$15k–$25k 9.1%

$25k–$35k 5.4%

$35k–$50k 8.1%

$50k–$75k 17.5%

$75k–$100k 20.1%

$100k–$150k 17.7%

$150k–$200k 8.4%

$200k+ 5.1%

Range	% of households
Under $10k	3.7%
$10k–$15k	4.7%
$15k–$25k	9.1%
$25k–$35k	5.4%
$35k–$50k	8.1%
$50k–$75k	17.5%
$75k–$100k	20.1%
$100k–$150k	17.7%
$150k–$200k	8.4%
$200k+	5.1%
Median income	$76,667

Housing

Home values

Under $50k 7.1%

$50k–$100k 3.0%

$100k–$150k 12.2%

$150k–$200k 6.8%

$200k–$300k 25.6%

$300k–$500k 22.3%

$500k–$1M 16.9%

$1M+ 6.1%

Housing overview

Metric	Value
Median home value	$286,300
Median rent / month	$954
Owner occupied	81.0%
Renter occupied	19.0%
Vacant	24.0%
Single-family detached	76.8%
Large apartment buildings	1.8%
Mobile homes	10.7%
Median rooms	5.6
Avg household size (owned)	2.29

Year built

Era	%
2020 or later	1.1%
2010–2019	8.1%
2000–2009	21.1%
1990–1999	9.3%
1980–1989	7.8%
1970–1979	17.0%
1960–1969	3.0%
1950–1959	8.4%
1940–1949	7.9%
1939 or earlier	16.3%

Bedrooms

Size	% of units
No bedroom (studio)	0.4%
1 bedroom	11.8%
2 bedrooms	25.6%
3 bedrooms	42.6%
4 bedrooms	13.7%
5+ bedrooms	5.9%

Vehicles per household

Vehicles	% of households
No vehicle	0.9%
1 vehicle	22.2%
2 vehicles	37.3%
3 or more	39.6%

Heating fuel

Fuel type	%
Utility gas	3.6%
Electricity	41.1%
Propane / LP gas	38.6%
Fuel oil	0.6%
Wood	13.9%

Households & families

Household type	Count	%
Married-couple family	1,481	59.1%
Cohabiting couple	202	8.1%
Male householder, no spouse	321	12.8%
Female householder, no spouse	504	20.1%
Households with children under 18	528	21.1%
Households with seniors (65+)	1,217	48.5%
Average household size	2.22

Marital status

Status	Male	Female
Never married	23.3%	18.1%
Married	63.0%	58.9%
Separated	2.3%	0.4%
Widowed	3.6%	9.5%
Divorced	7.9%	13.1%

Education

Less than 9th grade 3.7%

Some HS, no diploma 2.9%

HS graduate 29.8%

Some college, no degree 22.3%

Associate's degree 7.4%

Bachelor's degree 22.0%

Graduate / professional 11.9%

Metric	%
HS diploma or higher	93.4%
Bachelor's or higher	33.9%

School enrollment (ages 3–17)

Type	Count	%
Nursery / preschool	21	2.8%
Kindergarten	67	8.9%
Elementary school	320	42.7%
High school	232	31.0%
College / grad school	109	14.6%

Employment

Industry of employment

Education & healthcare 18.0%

Arts, food & hospitality 16.9%

Professional & management 12.0%

Construction 10.8%

Agriculture & mining 7.0%

Transportation & utilities 6.9%

Retail trade 6.4%

Manufacturing 6.3%

Public administration 5.9%

Finance & real estate 5.7%

Other services 4.1%

Occupation

Category	%
Management, business & arts	39.3%
Service	18.3%
Sales & office	20.5%
Natural resources & construction	11.0%
Production & transportation	10.9%

Employment type

Type	%
Private sector	69.8%
Government	19.9%
Self-employed	10.3%
Unpaid family workers	0.0%

Commute

Method	%
Drive alone	77.1%
Carpool	5.2%
Public transit	0.0%
Walk	3.0%
Work from home	12.5%
Other means	2.2%
Avg commute (minutes)	28.8

Poverty

All people 10.1%

Under 18 years 12.2%

18 and over 9.7%

Married-couple families 5.9%

Female-led households 22.5%

Income support

Source	% of households
Social Security	50.7%
Retirement income	38.7%
Supplemental Security	5.3%
Cash public assistance	3.6%
Food stamps / SNAP	4.7%

Health indicators

Condition	%
Obesity	34.2%
High blood pressure	38.3%
High cholesterol	36.2%
Diabetes	11.0%
Heart disease	8.7%
Stroke	3.8%
Asthma	8.9%
Arthritis	29.5%
Kidney disease	3.6%
Pulmonary disease	7.3%
Cancer	9.2%

Behavior / access	%
Smoking	17.1%
Binge drinking	16.6%
No physical activity	24.5%
Less than 7 hrs sleep	26.8%
Depression	15.4%
Fair or poor health	12.8%
Poor mental health	9.8%
Poor physical health	10.1%
No health insurance	10.7%
Visited doctor (checkup)	78.8%
Visited dentist	68.5%
Cholesterol screening	91.9%
Teeth loss	13.1%

Veterans & disability

Veterans	Count	%
Civilian veterans	732	14.7%

Disability	%
Any disability	21.6%
Under 18	2.5%
18–64 years	17.2%
65 and over	37.9%

Health insurance coverage

Type	%
Private insurance	74.2%
Public insurance	40.4%
No insurance	10.6%
Uninsured under 19	23.3%

Language & origin

Language spoken at home (age 5+)

Language	Count	%
English only	5,590	96.2%
Spanish	33	0.6%
Other Indo-European	29	0.5%
Asian & Pacific Islander	4	0.1%
Other languages	0	0.0%

Place of birth & citizenship

Origin	Count	%
Native born (US)	5,735	98.7%
Born in same state	5,713	98.3%
Born in different state	2,395	41.2%
Foreign born	22	0.4%
Naturalized citizen	74	1.3%
Not a US citizen	58	78.4%

Ancestry

Ancestry	Count	%
Italian	1,034	17.8%
French	740	12.7%
Polish	422	7.3%
English	243	4.2%
Arab	186	3.2%

Ancestry	Count	%
Dutch	146	2.5%
German	43	0.7%
Irish	28	0.5%
Norwegian	12	0.2%

Technology access

Metric	% of households
Computer access	43.2%
Internet access	93.9%

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

Frequently asked questions about ZIP code 57730

What city is ZIP code 57730 in?

ZIP code 57730 is primarily assigned to Custer, South Dakota.

What county is ZIP code 57730 in?

ZIP code 57730 falls within Custer County, South Dakota.

Does ZIP code 57730 have an older population?

32% of residents in ZIP code 57730 are 65 or older, above the national average of ~17%.

Does ZIP code 57730 have a large retiree population?

51% of households in ZIP code 57730 receive Social Security income, suggesting a significant retiree or disability population.

Is ZIP code 57730 mostly owner-occupied?

81% of occupied units in ZIP code 57730 are owner-occupied, well above the national average.

Does ZIP code 57730 have a large veteran population?

15% of civilians in ZIP code 57730 are veterans, above the national average of ~7%.

What timezone is ZIP code 57730 in?

ZIP code 57730 observes the MST timezone.