57051 ZIP Code — Oldham, SD

Kingsbury County, South Dakota

ZIP code 57051 is located in Oldham, South Dakota, within Kingsbury County. It covers approximately 78.84 square miles and serves a population of 226 residents. This is a standard ZIP code in the Central (CT) timezone, served by area code 605.

About ZIP code 57051

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 $77,700. Owner-occupancy is high at 88%, well above the national average.

The gap between median ($40,833) and mean household income suggests income inequality — a small number of higher earners pull the average up. The poverty rate of 7% is below the national average. 39% of households receive Social Security income, suggesting a notable retiree or disability population.

The dominant occupation class is production, transportation, and material moving, with agriculture and mining as the leading industry. The average commute of 21 minutes is near the national average.

Educational attainment is near the national average, with 22% of residents holding a bachelor's degree or higher.

Overall, ZIP code 57051 reflects a community defined by high homeownership and a significant Social Security-dependent population.

226

population

78.84

sq mi land

Standard

ZIP type

Central (CT)

timezone

57051 ZIP code map

Cities in ZIP code 57051

Below are the cities the US Postal Service accepts for ZIP code 57051. Using any city not on this list may result in mail delivery delays.

City	Status
Oldham	Preferred

Nearby ZIP codes

57054 Ramona (7.9 mi) 57249 Lake Preston (10.6 mi) 57212 Arlington (14.2 mi) 57231 De Smet (14.8 mi) 57076 Winfred (16.5 mi) 57349 Howard (17 mi) 57050 Nunda (17.2 mi) 57071 Volga (19.5 mi)

Demographics updated 05/2026

Population
Total population	226
Population density	3 / sq mi
State FIPS	46
County FIPS	077

Geography
Land area	78.84 sq mi
Water area	0.00 sq mi
Latitude	44.2252
Longitude	-97.3405
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	42.9%	37.0%	41.7%
$50k – $100k	45.0%	37.7%	33.8%
$100k – $200k	5.7%	21.3%	20.1%
Over $200k	6.4%	4.0%	4.4%

Demographics & statistics

226

Population

People per sq mi

51.5

Median age

$40,833

Median household income

$54,339

Per capita income

$77,700

Median home value

Median monthly rent

87.9%

Home ownership

7.1%

Poverty rate

0.0%

Unemployment

141

Housing units

21.5%

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	25	11.1%
18 and over	201	88.9%
65 and over	64	28.3%
Median age	51.5 years

Race & ethnicity

White 95.1%

Two or more races 4.9%

Group	Count	%
White	215	95.1%
Two or more races	11	4.9%

Household income

Income range	This ZIP	County avg	State avg
Under $50k	42.9%	37.0%	41.7%
$50k – $100k	45.0%	37.7%	33.8%
$100k – $200k	5.7%	21.3%	20.1%
Over $200k	6.4%	4.0%	4.4%

Under $10k 4.8%

$10k–$15k 4.8%

$15k–$25k 11.3%

$25k–$35k 25.0%

$35k–$50k 8.1%

$50k–$75k 20.2%

$75k–$100k 8.1%

$100k–$150k 8.9%

$200k+ 8.9%

Range	% of households
Under $10k	4.8%
$10k–$15k	4.8%
$15k–$25k	11.3%
$25k–$35k	25.0%
$35k–$50k	8.1%
$50k–$75k	20.2%
$75k–$100k	8.1%
$100k–$150k	8.9%
$200k+	8.9%
Median income	$40,833

Housing

Home values

Under $50k 25.7%

$50k–$100k 31.2%

$100k–$150k 10.1%

$150k–$200k 9.2%

$200k–$300k 8.3%

$300k–$500k 12.8%

$500k–$1M 2.8%

Housing overview

Metric	Value
Median home value	$77,700
Median rent / month	$0
Owner occupied	87.9%
Renter occupied	12.1%
Vacant	20.5%
Single-family detached	95.5%
Large apartment buildings	0.0%
Mobile homes	1.3%
Median rooms	6.7
Avg household size (owned)	1.82

Year built

Era	%
2020 or later	0.0%
2010–2019	1.3%
2000–2009	4.5%
1990–1999	1.3%
1980–1989	4.5%
1970–1979	2.6%
1960–1969	6.4%
1950–1959	5.1%
1940–1949	3.8%
1939 or earlier	70.5%

Bedrooms

Size	% of units
No bedroom (studio)	0.0%
1 bedroom	11.5%
2 bedrooms	17.9%
3 bedrooms	45.5%
4 bedrooms	16.7%
5+ bedrooms	8.3%

Vehicles per household

Vehicles	% of households
No vehicle	6.5%
1 vehicle	27.4%
2 vehicles	34.7%
3 or more	31.5%

Heating fuel

Fuel type	%
Utility gas	46.8%
Electricity	32.3%
Propane / LP gas	12.1%
Fuel oil	1.6%
Wood	6.5%

Households & families

Household type	Count	%
Married-couple family	39	31.5%
Cohabiting couple	7	5.6%
Male householder, no spouse	45	36.3%
Female householder, no spouse	33	26.6%
Households with children under 18	11	8.9%
Households with seniors (65+)	44	35.5%
Average household size	1.82

Marital status

Status	Male	Female
Never married	53.8%	22.6%
Married	32.5%	42.9%
Separated	2.6%	0.0%
Widowed	2.6%	17.9%
Divorced	8.5%	16.7%

Education

Less than 9th grade 0.6%

Some HS, no diploma 0.0%

HS graduate 40.5%

Some college, no degree 19.6%

Associate's degree 17.7%

Bachelor's degree 10.8%

Graduate / professional 10.8%

Metric	%
HS diploma or higher	99.4%
Bachelor's or higher	21.5%

School enrollment (ages 3–17)

Type	Count	%
Nursery / preschool	2	8.0%
Kindergarten	0	0.0%
Elementary school	10	40.0%
High school	4	16.0%
College / grad school	9	36.0%

Employment

Industry of employment

Agriculture & mining 20.2%

Manufacturing 20.2%

Transportation & utilities 17.5%

Education & healthcare 15.8%

Other services 7.0%

Professional & management 6.1%

Wholesale trade 4.4%

Retail trade 2.6%

Public administration 2.6%

Finance & real estate 1.8%

Construction 0.9%

Arts, food & hospitality 0.9%

Occupation

Category	%
Management, business & arts	22.8%
Service	15.8%
Sales & office	19.3%
Natural resources & construction	6.1%
Production & transportation	36.0%

Employment type

Type	%
Private sector	70.2%
Government	14.9%
Self-employed	13.2%
Unpaid family workers	1.8%

Commute

Method	%
Drive alone	82.1%
Carpool	4.5%
Public transit	0.0%
Walk	0.9%
Work from home	8.9%
Other means	3.6%
Avg commute (minutes)	21.3

Poverty

All people 7.1%

Under 18 years 0.0%

18 and over 8.0%

Married-couple families 2.6%

Female-led households 0.0%

Income support

Source	% of households
Social Security	38.7%
Retirement income	26.6%
Supplemental Security	0.0%
Cash public assistance	0.0%
Food stamps / SNAP	3.2%

Health indicators

Condition	%
Obesity	32.4%
High blood pressure	34.8%
High cholesterol	33.9%
Diabetes	10.3%
Heart disease	8.5%
Stroke	3.7%
Asthma	8.4%
Arthritis	27.1%
Kidney disease	3.4%
Pulmonary disease	6.6%
Cancer	8.9%

Behavior / access	%
Smoking	15.5%
Binge drinking	17.4%
No physical activity	24.6%
Less than 7 hrs sleep	26.0%
Depression	13.8%
Fair or poor health	11.8%
Poor mental health	9.6%
Poor physical health	9.1%
No health insurance	11.3%
Visited doctor (checkup)	77.3%
Visited dentist	69.3%
Cholesterol screening	90.6%
Teeth loss	14.1%

Veterans & disability

Veterans	Count	%
Civilian veterans	20	10.0%

Disability	%
Any disability	15.5%
Under 18	0.0%
18–64 years	12.4%
65 and over	28.1%

Health insurance coverage

Type	%
Private insurance	70.8%
Public insurance	41.6%
No insurance	4.9%
Uninsured under 19	0.0%

Language & origin

Language spoken at home (age 5+)

Language	Count	%
English only	219	96.9%
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)	226	100.0%
Born in same state	226	100.0%
Born in different state	162	71.7%
Foreign born	0	0.0%
Naturalized citizen	0	0.0%
Not a US citizen	0	0.0%

Ancestry

Ancestry	Count	%
Italian	57	25.2%
Polish	36	15.9%
Dutch	29	12.8%

Ancestry	Count	%
English	15	6.6%
Arab	8	3.5%
French	4	1.8%

Technology access

Metric	% of households
Computer access	54.9%
Internet access	87.9%

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

Frequently asked questions about ZIP code 57051

What city is ZIP code 57051 in?

ZIP code 57051 is primarily assigned to Oldham, South Dakota.

What county is ZIP code 57051 in?

ZIP code 57051 falls within Kingsbury County, South Dakota.

Does ZIP code 57051 have an older population?

28% of residents in ZIP code 57051 are 65 or older, above the national average of ~17%.

Is ZIP code 57051 mostly owner-occupied?

88% of occupied units in ZIP code 57051 are owner-occupied, well above the national average.

Does ZIP code 57051 have a large retiree population?

39% of households in ZIP code 57051 receive Social Security income, suggesting a significant retiree or disability population.

What is the typical home value in ZIP code 57051?

The median home value in ZIP code 57051 is $77,700.

What timezone is ZIP code 57051 in?

ZIP code 57051 observes the CST timezone.