57368 ZIP Code — Plankinton, SD
Aurora County, South Dakota
ZIP code 57368 is located in Plankinton, South Dakota, within Aurora County. It covers approximately 232.20 square miles and serves a population of 1,074 residents. This is a standard ZIP code in the Central (CT) timezone, served by area code 605.
About ZIP code 57368
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 $129,500. Owner-occupancy sits near the national average at 74%.
Median household income is $79,821. The poverty rate of 3% is below the national average.
The dominant occupation class is management, business, and professional, with education and healthcare as the leading industry. The average commute of 18 minutes is near the national average.
Educational attainment is near the national average, with 28% of residents holding a bachelor's degree or higher.
1,074
population
232.20
sq mi land
Standard
ZIP type
Central (CT)
timezone
57368 ZIP code map
Cities in ZIP code 57368
Below are the cities the US Postal Service accepts for ZIP code 57368. Using any city not on this list may result in mail delivery delays.
| City | Status |
|---|---|
| Plankinton | Preferred |
Nearby ZIP codes
57383 White Lake (10 mi)
57363 Mount Vernon (12.3 mi)
57375 Stickney (13.3 mi)
57359 Letcher (17.1 mi)
Demographics
updated 05/2026
| Population | |
|---|---|
| Total population | 1,074 |
| Population density | 5 / sq mi |
| State FIPS | 46 |
| County FIPS | 003 |
| Geography | |
|---|---|
| Land area | 232.20 sq mi |
| Water area | 0.40 sq mi |
| Latitude | 43.7610 |
| Longitude | -98.4751 |
| 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 | 31.1% | 33.6% | 41.7% |
| $50k – $100k | 45.2% | 42.6% | 33.8% |
| $100k – $200k | 17.0% | 17.7% | 20.1% |
| Over $200k | 6.6% | 6.0% | 4.4% |
Demographics & statistics
1,074
Population
5
People per sq mi
38.7
Median age
$79,821
Median household income
$39,147
Per capita income
$129,500
Median home value
$875
Median monthly rent
74.2%
Home ownership
2.9%
Poverty rate
0.6%
Unemployment
378
Housing units
27.6%
Bachelor's or higher
Age distribution
Male
Female
30
Under 5
29
41
5–9
38
47
10–14
45
43
15–19
41
56
20–24
53
35
25–34
34
83
35–44
79
73
45–54
69
50
55–59
48
29
60–64
27
44
65–74
41
12
75–84
12
8
85+
7
← Male
Female →
Age summary
| Group | Count | % |
|---|---|---|
| Under 18 | 290 | 27.0% |
| 18 and over | 784 | 73.0% |
| 65 and over | 124 | 11.5% |
| Median age | 38.7 years | |
Race & ethnicity
White
88.6%
Two or more races
3.7%
Hispanic or Latino
2.7%
Black or African American
2.2%
American Indian / Alaska Native
2.2%
Asian
0.5%
Other race
0.1%
| Group | Count | % |
|---|---|---|
| White | 978 | 88.6% |
| Two or more races | 41 | 3.7% |
| Hispanic or Latino | 30 | 2.7% |
| Black or African American | 24 | 2.2% |
| American Indian / Alaska Native | 24 | 2.2% |
| Asian | 6 | 0.5% |
| Other race | 1 | 0.1% |
Household income
| Income range | This ZIP | County avg | State avg |
|---|---|---|---|
| Under $50k | 31.1% | 33.6% | 41.7% |
| $50k – $100k | 45.2% | 42.6% | 33.8% |
| $100k – $200k | 17.0% | 17.7% | 20.1% |
| Over $200k | 6.6% | 6.0% | 4.4% |
$10k–$15k
0.7%
$15k–$25k
8.5%
$25k–$35k
4.4%
$35k–$50k
9.2%
$50k–$75k
23.4%
$75k–$100k
17.8%
$100k–$150k
25.3%
$150k–$200k
4.1%
$200k+
6.6%
| Range | % of households |
|---|---|
| $10k–$15k | 0.7% |
| $15k–$25k | 8.5% |
| $25k–$35k | 4.4% |
| $35k–$50k | 9.2% |
| $50k–$75k | 23.4% |
| $75k–$100k | 17.8% |
| $100k–$150k | 25.3% |
| $150k–$200k | 4.1% |
| $200k+ | 6.6% |
| Median income | $79,821 |
Housing
Home values
Under $50k
11.8%
$50k–$100k
25.9%
$100k–$150k
23.6%
$150k–$200k
6.6%
$200k–$300k
17.7%
$300k–$500k
9.2%
$500k–$1M
5.2%
Housing overview
| Metric | Value |
|---|---|
| Median home value | $129,500 |
| Median rent / month | $875 |
| Owner occupied | 74.2% |
| Renter occupied | 25.8% |
| Vacant | 15.1% |
| Single-family detached | 83.5% |
| Large apartment buildings | 0.0% |
| Mobile homes | 9.1% |
| Median rooms | 6.5 |
| Avg household size (owned) | 2.55 |
Year built
| Era | % |
|---|---|
| 2020 or later | 0.0% |
| 2010–2019 | 11.4% |
| 2000–2009 | 20.5% |
| 1990–1999 | 6.6% |
| 1980–1989 | 6.8% |
| 1970–1979 | 12.4% |
| 1960–1969 | 4.8% |
| 1950–1959 | 4.8% |
| 1940–1949 | 0.0% |
| 1939 or earlier | 32.9% |
Bedrooms
| Size | % of units |
|---|---|
| No bedroom (studio) | 0.0% |
| 1 bedroom | 5.2% |
| 2 bedrooms | 19.8% |
| 3 bedrooms | 41.1% |
| 4 bedrooms | 21.9% |
| 5+ bedrooms | 12.0% |
Vehicles per household
| Vehicles | % of households |
|---|---|
| No vehicle | 0.5% |
| 1 vehicle | 22.9% |
| 2 vehicles | 41.6% |
| 3 or more | 35.0% |
Heating fuel
| Fuel type | % |
|---|---|
| Utility gas | 3.4% |
| Electricity | 56.4% |
| Propane / LP gas | 30.2% |
| Fuel oil | 4.4% |
| Wood | 1.5% |
| No fuel used | 1.5% |
Households & families
| Household type | Count | % |
|---|---|---|
| Married-couple family | 231 | 56.2% |
| Cohabiting couple | 43 | 10.5% |
| Male householder, no spouse | 54 | 13.1% |
| Female householder, no spouse | 83 | 20.2% |
| Households with children under 18 | 143 | 34.8% |
| Households with seniors (65+) | 98 | 23.8% |
| Average household size | 2.46 | |
Marital status
| Status | Male | Female |
|---|---|---|
| Never married | 35.0% | 21.9% |
| Married | 56.5% | 56.5% |
| Separated | 0.7% | 2.3% |
| Widowed | 0.2% | 7.1% |
| Divorced | 7.5% | 12.2% |
Education
Less than 9th grade
4.3%
Some HS, no diploma
2.6%
HS graduate
27.8%
Some college, no degree
18.1%
Associate's degree
19.5%
Bachelor's degree
20.6%
Graduate / professional
7.1%
| Metric | % |
|---|---|
| HS diploma or higher | 93.1% |
| Bachelor's or higher | 27.6% |
School enrollment (ages 3–17)
| Type | Count | % |
|---|---|---|
| Nursery / preschool | 20 | 6.8% |
| Kindergarten | 8 | 2.7% |
| Elementary school | 141 | 47.8% |
| High school | 78 | 26.4% |
| College / grad school | 48 | 16.3% |
Employment
Industry of employment
Education & healthcare
25.7%
Retail trade
14.4%
Agriculture & mining
13.6%
Manufacturing
12.9%
Transportation & utilities
7.3%
Professional & management
5.7%
Construction
5.1%
Other services
3.9%
Finance & real estate
3.1%
Public administration
2.6%
Arts, food & hospitality
2.3%
Information
1.7%
Wholesale trade
1.6%
Occupation
| Category | % |
|---|---|
| Management, business & arts | 33.3% |
| Service | 14.1% |
| Sales & office | 16.7% |
| Natural resources & construction | 15.5% |
| Production & transportation | 20.3% |
Employment type
| Type | % |
|---|---|
| Private sector | 76.7% |
| Government | 15.2% |
| Self-employed | 8.1% |
| Unpaid family workers | 0.0% |
Commute
| Method | % |
|---|---|
| Drive alone | 77.5% |
| Carpool | 7.8% |
| Public transit | 0.0% |
| Walk | 5.9% |
| Work from home | 8.4% |
| Other means | 0.3% |
| Avg commute (minutes) | 18.2 |
Poverty
All people
2.9%
Under 18 years
2.9%
18 and over
2.9%
Married-couple families
0.9%
Female-led households
3.1%
Income support
| Source | % of households |
|---|---|
| Social Security | 18.2% |
| Retirement income | 21.7% |
| Supplemental Security | 2.7% |
| Cash public assistance | 0.2% |
| Food stamps / SNAP | 4.4% |
Health indicators
| Condition | % |
|---|---|
| Obesity | 33.5% |
| High blood pressure | 30.1% |
| High cholesterol | 30.9% |
| Diabetes | 8.6% |
| Heart disease | 6.5% |
| Stroke | 2.9% |
| Asthma | 8.5% |
| Arthritis | 23.2% |
| Kidney disease | 2.8% |
| Pulmonary disease | 5.6% |
| Cancer | 7.3% |
| Behavior / access | % |
|---|---|
| Smoking | 17.0% |
| Binge drinking | 19.8% |
| No physical activity | 22.1% |
| Less than 7 hrs sleep | 29.1% |
| Depression | 15.1% |
| Fair or poor health | 10.7% |
| Poor mental health | 10.4% |
| Poor physical health | 8.3% |
| No health insurance | 13.4% |
| Visited doctor (checkup) | 74.3% |
| Visited dentist | 66.3% |
| Cholesterol screening | 89.1% |
| Teeth loss | 13.1% |
Veterans & disability
| Veterans | Count | % |
|---|---|---|
| Civilian veterans | 39 | 5.0% |
| Disability | % |
|---|---|
| Any disability | 10.5% |
| Under 18 | 4.1% |
| 18–64 years | 9.7% |
| 65 and over | 27.4% |
Health insurance coverage
| Type | % |
|---|---|
| Private insurance | 80.3% |
| Public insurance | 22.4% |
| No insurance | 6.3% |
| Uninsured under 19 | 1.2% |
Language & origin
Language spoken at home (age 5+)
| Language | Count | % |
|---|---|---|
| English only | 1,015 | 94.5% |
| Spanish | 72 | 7.1% |
| Other Indo-European | 72 | 7.1% |
| Asian & Pacific Islander | 0 | 0.0% |
| Other languages | 0 | 0.0% |
Place of birth & citizenship
| Origin | Count | % |
|---|---|---|
| Native born (US) | 987 | 91.9% |
| Born in same state | 974 | 90.7% |
| Born in different state | 796 | 74.1% |
| Foreign born | 13 | 1.2% |
| Naturalized citizen | 87 | 8.1% |
| Not a US citizen | 16 | 18.4% |
Ancestry
| Ancestry | Count | % |
|---|---|---|
| Polish | 124 | 11.5% |
| French | 98 | 9.1% |
| English | 90 | 8.4% |
| Italian | 74 | 6.9% |
| Ancestry | Count | % |
|---|---|---|
| Arab | 57 | 5.3% |
| Dutch | 7 | 0.7% |
| German | 2 | 0.2% |
Technology access
| Metric | % of households |
|---|---|
| Computer access | 38.3% |
| Internet access | 96.4% |
Source: U.S. Census Bureau, American Community Survey 2025 estimates.
Frequently asked questions about ZIP code 57368
What city is ZIP code 57368 in?
ZIP code 57368 is primarily assigned to Plankinton, South Dakota.
What county is ZIP code 57368 in?
ZIP code 57368 falls within Aurora County, South Dakota.
What is the typical home value in ZIP code 57368?
The median home value in ZIP code 57368 is $129,500.
What is the population of ZIP code 57368?
ZIP code 57368 has an estimated population of 1,074 residents, with a density of 5 people per square mile.
What is the median household income in ZIP code 57368?
The median household income in ZIP code 57368 is $79,821, above the national median of ~$75,000.
What timezone is ZIP code 57368 in?
ZIP code 57368 observes the CST timezone.