57330 ZIP Code — Delmont, SD

Douglas County, South Dakota

ZIP code 57330 is located in Delmont, South Dakota, within Douglas County. It covers approximately 116.02 square miles and serves a population of 548 residents. This is a standard ZIP code in the Central (CT) timezone, served by area code 605.

About ZIP code 57330

The housing stock consists of predominantly single-family detached homes. Most homes were built in the pre-1940, giving the area an established character. Median home value is $150,000. Owner-occupancy is high at 80%, well above the national average.

Median household income is $58,542. 52% 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 20 minutes is near the national average.

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

Overall, ZIP code 57330 reflects a community defined by high homeownership and a significant Social Security-dependent population.

548

population

116.02

sq mi land

Standard

ZIP type

Central (CT)

timezone

57330 ZIP code map

Cities in ZIP code 57330

Below are the cities the US Postal Service accepts for ZIP code 57330. Using any city not on this list may result in mail delivery delays.

City	Status
Delmont	Preferred

Nearby ZIP codes

57376 Tripp (11.1 mi) 57313 Armour (11.4 mi) 57366 Parkston (13.9 mi) 57331 Dimock (15.2 mi) 57380 Wagner (16.9 mi) 57328 Corsica (17.1 mi) 57315 Avon (19.5 mi) 57334 Ethan (19.9 mi)

Demographics updated 05/2026

Population
Total population	548
Population density	5 / sq mi
State FIPS	46
County FIPS	043

Geography
Land area	116.02 sq mi
Water area	0.07 sq mi
Latitude	43.2617
Longitude	-98.1681
Timezone	Central (CT)
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	46.8%	42.2%	41.7%
$50k – $100k	32.7%	34.5%	33.8%
$100k – $200k	13.5%	20.3%	20.1%
Over $200k	7.0%	3.0%	4.4%

Demographics & statistics

548

Population

People per sq mi

36.6

Median age

$58,542

Median household income

$30,745

Per capita income

$150,000

Median home value

$578

Median monthly rent

79.8%

Home ownership

13.0%

Poverty rate

0.5%

Unemployment

182

Housing units

24.2%

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

75–84

85+

← Male

Female →

Age summary

Group	Count	%
Under 18	179	32.7%
18 and over	369	67.3%
65 and over	112	20.4%
Median age	36.6 years

Race & ethnicity

White 90.9%

Two or more races 5%

Hispanic or Latino 1.8%

American Indian / Alaska Native 1.4%

Other race 0.9%

Group	Count	%
White	507	90.9%
Two or more races	28	5%
Hispanic or Latino	10	1.8%
American Indian / Alaska Native	8	1.4%
Other race	5	0.9%

Household income

Income range	This ZIP	County avg	State avg
Under $50k	46.8%	42.2%	41.7%
$50k – $100k	32.7%	34.5%	33.8%
$100k – $200k	13.5%	20.3%	20.1%
Over $200k	7.0%	3.0%	4.4%

Under $10k 6.2%

$10k–$15k 7.3%

$15k–$25k 11.2%

$25k–$35k 1.7%

$35k–$50k 17.4%

$50k–$75k 19.1%

$75k–$100k 6.7%

$100k–$150k 16.9%

$150k–$200k 5.6%

$200k+ 7.9%

Range	% of households
Under $10k	6.2%
$10k–$15k	7.3%
$15k–$25k	11.2%
$25k–$35k	1.7%
$35k–$50k	17.4%
$50k–$75k	19.1%
$75k–$100k	6.7%
$100k–$150k	16.9%
$150k–$200k	5.6%
$200k+	7.9%
Median income	$58,542

Housing

Home values

Under $50k 12.7%

$50k–$100k 26.8%

$100k–$150k 10.6%

$150k–$200k 26.8%

$200k–$300k 6.3%

$300k–$500k 4.9%

$500k–$1M 7.0%

$1M+ 4.9%

Housing overview

Metric	Value
Median home value	$150,000
Median rent / month	$578
Owner occupied	79.8%
Renter occupied	20.2%
Vacant	18.3%
Single-family detached	94.0%
Large apartment buildings	0.0%
Mobile homes	4.1%
Median rooms	6.8
Avg household size (owned)	2.92

Year built

Era	%
2020 or later	0.0%
2010–2019	11.9%
2000–2009	1.8%
1990–1999	6.9%
1980–1989	3.7%
1970–1979	1.8%
1960–1969	6.9%
1950–1959	11.0%
1940–1949	17.9%
1939 or earlier	38.1%

Bedrooms

Size	% of units
No bedroom (studio)	1.4%
1 bedroom	0.5%
2 bedrooms	15.6%
3 bedrooms	45.4%
4 bedrooms	27.5%
5+ bedrooms	9.6%

Vehicles per household

Vehicles	% of households
No vehicle	0.0%
1 vehicle	20.2%
2 vehicles	20.8%
3 or more	59.0%

Heating fuel

Fuel type	%
Utility gas	5.1%
Electricity	44.9%
Propane / LP gas	39.9%
Fuel oil	4.5%
Wood	2.2%
No fuel used	0.6%

Households & families

Household type	Count	%
Married-couple family	104	58.4%
Cohabiting couple	5	2.8%
Male householder, no spouse	44	24.7%
Female householder, no spouse	25	14.0%
Households with children under 18	60	33.7%
Households with seniors (65+)	73	41.0%
Average household size	2.85

Marital status

Status	Male	Female
Never married	26.7%	18.5%
Married	58.9%	59.5%
Separated	0.0%	0.0%
Widowed	5.0%	17.2%
Divorced	9.4%	4.7%

Education

Less than 9th grade 6.3%

Some HS, no diploma 4.3%

HS graduate 25.6%

Some college, no degree 27.7%

Associate's degree 11.8%

Bachelor's degree 17.6%

Graduate / professional 6.6%

Metric	%
HS diploma or higher	89.3%
Bachelor's or higher	24.2%

School enrollment (ages 3–17)

Type	Count	%
Nursery / preschool	19	12.5%
Kindergarten	13	8.6%
Elementary school	77	50.7%
High school	40	26.3%
College / grad school	3	2.0%

Employment

Industry of employment

Education & healthcare 35.5%

Agriculture & mining 26.6%

Retail trade 9.8%

Construction 8.9%

Public administration 8.9%

Other services 3.7%

Transportation & utilities 2.8%

Professional & management 1.9%

Manufacturing 1.4%

Wholesale trade 0.5%

Occupation

Category	%
Management, business & arts	48.1%
Service	21.5%
Sales & office	7.0%
Natural resources & construction	13.1%
Production & transportation	10.3%

Employment type

Type	%
Private sector	47.2%
Government	22.4%
Self-employed	30.4%
Unpaid family workers	0.0%

Commute

Method	%
Drive alone	75.2%
Carpool	0.0%
Public transit	0.0%
Walk	17.8%
Work from home	6.1%
Other means	0.9%
Avg commute (minutes)	19.5

Poverty

All people 13.0%

Under 18 years 8.9%

18 and over 14.6%

Married-couple families 1.9%

Female-led households 0.0%

Income support

Source	% of households
Social Security	52.2%
Retirement income	20.2%
Supplemental Security	2.2%
Cash public assistance	2.2%
Food stamps / SNAP	3.4%

Health indicators

Condition	%
Obesity	34.6%
High blood pressure	34.4%
High cholesterol	34.2%
Diabetes	10.4%
Heart disease	8.3%
Stroke	3.6%
Asthma	8.9%
Arthritis	26.6%
Kidney disease	3.3%
Pulmonary disease	6.9%
Cancer	8.3%

Behavior / access	%
Smoking	17.9%
Binge drinking	18.0%
No physical activity	24.2%
Less than 7 hrs sleep	28.3%
Depression	15.1%
Fair or poor health	12.6%
Poor mental health	10.5%
Poor physical health	9.7%
No health insurance	12.3%
Visited doctor (checkup)	76.4%
Visited dentist	67.3%
Cholesterol screening	90.0%
Teeth loss	15.0%

Veterans & disability

Veterans	Count	%
Civilian veterans	37	10.0%

Disability	%
Any disability	12.4%
Under 18	0.0%
18–64 years	10.5%
65 and over	36.6%

Health insurance coverage

Type	%
Private insurance	71.4%
Public insurance	31.0%
No insurance	12.2%
Uninsured under 19	21.8%

Language & origin

Language spoken at home (age 5+)

Language	Count	%
English only	506	92.3%
Spanish	20	4.0%
Other Indo-European	0	0.0%
Asian & Pacific Islander	20	4.0%
Other languages	0	0.0%

Place of birth & citizenship

Origin	Count	%
Native born (US)	548	100.0%
Born in same state	548	100.0%
Born in different state	481	87.8%
Foreign born	0	0.0%
Naturalized citizen	0	0.0%
Not a US citizen	0	0.0%

Ancestry

Ancestry	Count	%
Italian	65	11.9%
Polish	39	7.1%
French	33	6%

Ancestry	Count	%
Dutch	20	3.6%
Arab	11	2%
English	6	1.1%

Technology access

Metric	% of households
Computer access	32.5%
Internet access	92.1%

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

Frequently asked questions about ZIP code 57330

What city is ZIP code 57330 in?

ZIP code 57330 is primarily assigned to Delmont, South Dakota.

What county is ZIP code 57330 in?

ZIP code 57330 falls within Douglas County, South Dakota.

Is ZIP code 57330 family-oriented?

33% of residents in ZIP code 57330 are under 18, reflecting a younger, family-oriented community.

Does ZIP code 57330 have a large retiree population?

52% of households in ZIP code 57330 receive Social Security income, suggesting a significant retiree or disability population.

What is the typical home value in ZIP code 57330?

The median home value in ZIP code 57330 is $150,000.

Does ZIP code 57330 have a large veteran population?

10% of civilians in ZIP code 57330 are veterans, above the national average of ~7%.

What timezone is ZIP code 57330 in?

ZIP code 57330 observes the CST timezone.