57787 ZIP Code — Union Center, SD

Meade County, South Dakota

ZIP code 57787 is located in Union Center, South Dakota, within Meade County. It covers approximately 627.24 square miles and serves a population of 677 residents. This is a standard ZIP code in the Mountain (MT) timezone, served by area code 605.

About ZIP code 57787

The housing stock consists of predominantly single-family detached homes. Most homes were built in the 1950s, giving the area an established character. Owner-occupancy sits near the national average at 72%.

Median household income is $56,422. Poverty affects 27% of residents, above the national average.

The dominant occupation class is management, business, and professional, with agriculture and mining as the leading industry. The average commute of 18 minutes is near the national average. Remote work is prevalent — 48% of workers work from home.

Educational attainment is high — 46% of residents hold a bachelor's degree or higher, well above the national average of 33%.

Overall, ZIP code 57787 reflects a community defined by economic challenges above the national average and a high rate of remote workers.

677

population

627.24

sq mi land

Standard

ZIP type

Mountain (MT)

timezone

57787 ZIP code map

Cities in ZIP code 57787

Below are the cities the US Postal Service accepts for ZIP code 57787. Using any city not on this list may result in mail delivery delays.

City	Status
Union Center	Acceptable
Union Center	Preferred

Nearby ZIP codes

57737 Enning (10.7 mi) 57792 White Owl (14 mi)

Demographics updated 05/2026

Population
Total population	677
Population density	1 / sq mi
State FIPS	46
County FIPS	093

Geography
Land area	627.24 sq mi
Water area	0.98 sq mi
Latitude	44.6819
Longitude	-102.6573
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	73.7%	42.5%	41.7%
$50k – $100k	17.2%	36.9%	33.8%
$100k – $200k	9.1%	17.5%	20.1%
Over $200k	0.0%	3.1%	4.4%

Demographics & statistics

677

Population

People per sq mi

33.7

Median age

$56,422

Median household income

$18,992

Per capita income

Median home value

$852

Median monthly rent

71.7%

Home ownership

27.3%

Poverty rate

0.0%

Unemployment

152

Housing units

46.1%

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	214	31.6%
18 and over	463	68.4%
65 and over	21	3.1%
Median age	33.7 years

Race & ethnicity

White 77.7%

Hispanic or Latino 11.2%

Two or more races 11.2%

Group	Count	%
White	592	77.7%
Hispanic or Latino	85	11.2%
Two or more races	85	11.2%

Household income

Income range	This ZIP	County avg	State avg
Under $50k	73.7%	42.5%	41.7%
$50k – $100k	17.2%	36.9%	33.8%
$100k – $200k	9.1%	17.5%	20.1%
Over $200k	0.0%	3.1%	4.4%

$15k–$25k 17.1%

$35k–$50k 24.1%

$50k–$75k 21.4%

$75k–$100k 28.3%

$100k–$150k 4.3%

$150k–$200k 4.8%

Range	% of households
$15k–$25k	17.1%
$35k–$50k	24.1%
$50k–$75k	21.4%
$75k–$100k	28.3%
$100k–$150k	4.3%
$150k–$200k	4.8%
Median income	$56,422

Housing

Home values

Under $50k 22.4%

$50k–$100k 26.1%

$100k–$150k 16.4%

$200k–$300k 23.9%

$300k–$500k 11.2%

Housing overview

Metric	Value
Median home value	$0
Median rent / month	$852
Owner occupied	71.7%
Renter occupied	28.3%
Vacant	8.8%
Single-family detached	80.5%
Large apartment buildings	0.0%
Mobile homes	19.5%
Median rooms	5.7
Avg household size (owned)	3.66

Year built

Era	%
2020 or later	0.0%
2010–2019	15.6%
2000–2009	0.0%
1990–1999	19.0%
1980–1989	8.3%
1970–1979	0.0%
1960–1969	18.5%
1950–1959	31.2%
1940–1949	1.0%
1939 or earlier	6.3%

Bedrooms

Size	% of units
No bedroom (studio)	0.0%
1 bedroom	8.8%
2 bedrooms	31.2%
3 bedrooms	47.8%
4 bedrooms	8.8%
5+ bedrooms	3.4%

Vehicles per household

Vehicles	% of households
No vehicle	0.0%
1 vehicle	2.7%
2 vehicles	28.9%
3 or more	68.4%

Heating fuel

Fuel type	%
Propane / LP gas	88.2%
Wood	11.8%

Households & families

Household type	Count	%
Married-couple family	172	92.0%
Cohabiting couple	0	0.0%
Male householder, no spouse	5	2.7%
Female householder, no spouse	10	5.3%
Households with children under 18	118	63.1%
Households with seniors (65+)	12	6.4%
Average household size	3.62

Marital status

Status	Male	Female
Never married	22.7%	9.3%
Married	77.3%	86.3%
Separated	0.0%	0.0%
Widowed	0.0%	4.4%
Divorced	0.0%	0.0%

Education

Less than 9th grade 0.0%

Some HS, no diploma 4.1%

HS graduate 34.9%

Some college, no degree 4.4%

Associate's degree 10.5%

Bachelor's degree 46.1%

Graduate / professional 0.0%

Metric	%
HS diploma or higher	95.9%
Bachelor's or higher	46.1%

School enrollment (ages 3–17)

Type	Count	%
Nursery / preschool	0	0.0%
Kindergarten	0	0.0%
Elementary school	154	70.6%
High school	64	29.4%
College / grad school	0	0.0%

Employment

Industry of employment

Agriculture & mining 53.7%

Education & healthcare 17.0%

Transportation & utilities 14.9%

Retail trade 5.6%

Other services 4.8%

Arts, food & hospitality 2.3%

Manufacturing 1.8%

Occupation

Category	%
Management, business & arts	71.4%
Service	2.3%
Sales & office	12.9%
Natural resources & construction	0.0%
Production & transportation	13.4%

Employment type

Type	%
Private sector	39.7%
Government	17.5%
Self-employed	42.8%
Unpaid family workers	0.0%

Commute

Method	%
Drive alone	39.7%
Carpool	6.3%
Public transit	0.0%
Walk	5.6%
Work from home	48.4%
Other means	0.0%
Avg commute (minutes)	17.9

Poverty

All people 27.3%

Under 18 years 49.1%

18 and over 17.3%

Married-couple families 18.6%

Female-led households 0.0%

Income support

Source	% of households
Social Security	6.4%
Retirement income	6.4%
Supplemental Security	0.0%
Cash public assistance	0.0%
Food stamps / SNAP	0.0%

Health indicators

Condition	%
Obesity	30.0%
High blood pressure	32.9%
High cholesterol	29.4%
Diabetes	9.4%
Heart disease	7.4%
Stroke	3.2%
Asthma	8.6%
Arthritis	25.8%
Kidney disease	3.0%
Pulmonary disease	6.2%
Cancer	7.3%

Behavior / access	%
Smoking	18.2%
Binge drinking	18.2%
No physical activity	22.5%
Less than 7 hrs sleep	30.5%
Depression	15.1%
Fair or poor health	11.3%
Poor mental health	10.6%
Poor physical health	9.0%
No health insurance	11.5%
Visited doctor (checkup)	73.7%
Visited dentist	63.0%
Cholesterol screening	89.5%
Teeth loss	14.4%

Veterans & disability

Veterans	Count	%
Civilian veterans	0	0.0%

Disability	%
Any disability	0.3%
Under 18	0.0%
18–64 years	0.0%
65 and over	9.5%

Health insurance coverage

Type	%
Private insurance	88.0%
Public insurance	3.1%
No insurance	10.3%
Uninsured under 19	13.5%

Language & origin

Language spoken at home (age 5+)

Language	Count	%
English only	650	96.0%
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)	677	100.0%
Born in same state	677	100.0%
Born in different state	549	81.1%
Foreign born	0	0.0%
Naturalized citizen	0	0.0%
Not a US citizen	0	0.0%

Ancestry

Ancestry	Count	%
Polish	155	22.9%
Italian	145	21.4%
French	57	8.4%

Ancestry	Count	%
English	55	8.1%
Arab	32	4.7%

Technology access

Metric	% of households
Computer access	27.6%
Internet access	100.0%

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

Frequently asked questions about ZIP code 57787

What city is ZIP code 57787 in?

ZIP code 57787 is primarily assigned to Union Center, South Dakota.

What county is ZIP code 57787 in?

ZIP code 57787 falls within Meade County, South Dakota.

Is ZIP code 57787 family-oriented?

32% of residents in ZIP code 57787 are under 18, reflecting a younger, family-oriented community.

What is the poverty rate in ZIP code 57787?

27% of residents in ZIP code 57787 live below the poverty line, above the national average.

How educated is the population of ZIP code 57787?

46% of residents hold a bachelor's degree or higher — well above the national average of ~33%, reflecting a highly educated population.

What is the population of ZIP code 57787?

ZIP code 57787 has an estimated population of 677 residents, with a density of 1 people per square mile.

What timezone is ZIP code 57787 in?

ZIP code 57787 observes the MST timezone.