57645 ZIP Code — Morristown, SD
Corson County, South Dakota
ZIP code 57645 is located in Morristown, South Dakota, within Corson County. It covers approximately 302.15 square miles and serves a population of 142 residents. This is a standard ZIP code in the Mountain (MT) timezone, served by area code 605.
142
population
302.15
sq mi land
Standard
ZIP type
Mountain (MT)
timezone
57645 ZIP code map
Cities in ZIP code 57645
Below are the cities the US Postal Service accepts for ZIP code 57645. Using any city not on this list may result in mail delivery delays.
| City | Status |
|---|---|
| Morristown | Preferred |
Nearby ZIP codes
Demographics
updated 05/2026
| Population | |
|---|---|
| Total population | 142 |
| Population density | 0 / sq mi |
| State FIPS | 46 |
| County FIPS | 031 |
| Geography | |
|---|---|
| Land area | 302.15 sq mi |
| Water area | 0.54 sq mi |
| Latitude | 45.8381 |
| Longitude | -101.6903 |
| 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 | 70.8% | 61.0% | 41.7% |
| $50k – $100k | 6.9% | 23.8% | 33.8% |
| $100k – $200k | 9.7% | 12.9% | 20.1% |
| Over $200k | 12.5% | 2.3% | 4.4% |
Demographics & statistics
142
Population
51.1
Median age
$44,688
Median household income
$38,468
Per capita income
$33,300
Median home value
$0
Median monthly rent
93.2%
Home ownership
19.7%
Poverty rate
0.0%
Unemployment
92
Housing units
20.4%
Bachelor's or higher
Age distribution
Male
Female
1
5–9
1
8
10–14
7
5
15–19
5
4
20–24
3
2
25–34
2
8
35–44
7
15
45–54
13
4
55–59
3
6
60–64
5
14
65–74
12
8
75–84
8
1
85+
0
← Male
Female →
Age summary
| Group | Count | % |
|---|---|---|
| Under 18 | 27 | 19.0% |
| 18 and over | 115 | 81.0% |
| 65 and over | 43 | 30.3% |
| Median age | 51.1 years | |
Race & ethnicity
White
86.6%
American Indian / Alaska Native
10.6%
Two or more races
2.8%
| Group | Count | % |
|---|---|---|
| White | 123 | 86.6% |
| American Indian / Alaska Native | 15 | 10.6% |
| Two or more races | 4 | 2.8% |
Household income
| Income range | This ZIP | County avg | State avg |
|---|---|---|---|
| Under $50k | 70.8% | 61.0% | 41.7% |
| $50k – $100k | 6.9% | 23.8% | 33.8% |
| $100k – $200k | 9.7% | 12.9% | 20.1% |
| Over $200k | 12.5% | 2.3% | 4.4% |
Under $10k
8.2%
$10k–$15k
11.0%
$15k–$25k
15.1%
$25k–$35k
5.5%
$35k–$50k
15.1%
$50k–$75k
17.8%
$75k–$100k
6.8%
$100k–$150k
11.0%
$150k–$200k
2.7%
$200k+
6.8%
| Range | % of households |
|---|---|
| Under $10k | 8.2% |
| $10k–$15k | 11.0% |
| $15k–$25k | 15.1% |
| $25k–$35k | 5.5% |
| $35k–$50k | 15.1% |
| $50k–$75k | 17.8% |
| $75k–$100k | 6.8% |
| $100k–$150k | 11.0% |
| $150k–$200k | 2.7% |
| $200k+ | 6.8% |
| Median income | $44,688 |
Housing
Home values
Under $50k
57.4%
$50k–$100k
20.6%
$100k–$150k
5.9%
$150k–$200k
2.9%
$200k–$300k
2.9%
$300k–$500k
10.3%
Housing overview
| Metric | Value |
|---|---|
| Median home value | $33,300 |
| Median rent / month | $0 |
| Owner occupied | 93.2% |
| Renter occupied | 6.8% |
| Vacant | 24.7% |
| Single-family detached | 92.8% |
| Large apartment buildings | 0.0% |
| Mobile homes | 7.2% |
| Median rooms | 5.7 |
| Avg household size (owned) | 1.93 |
Year built
| Era | % |
|---|---|
| 2020 or later | 0.0% |
| 2010–2019 | 4.1% |
| 2000–2009 | 2.1% |
| 1990–1999 | 2.1% |
| 1980–1989 | 3.1% |
| 1970–1979 | 13.4% |
| 1960–1969 | 7.2% |
| 1950–1959 | 7.2% |
| 1940–1949 | 2.1% |
| 1939 or earlier | 58.8% |
Bedrooms
| Size | % of units |
|---|---|
| No bedroom (studio) | 2.1% |
| 1 bedroom | 8.2% |
| 2 bedrooms | 22.7% |
| 3 bedrooms | 41.2% |
| 4 bedrooms | 16.5% |
| 5+ bedrooms | 9.3% |
Vehicles per household
| Vehicles | % of households |
|---|---|
| No vehicle | 2.7% |
| 1 vehicle | 24.7% |
| 2 vehicles | 38.4% |
| 3 or more | 34.2% |
Heating fuel
| Fuel type | % |
|---|---|
| Electricity | 8.2% |
| Propane / LP gas | 83.6% |
| Fuel oil | 8.2% |
Households & families
| Household type | Count | % |
|---|---|---|
| Married-couple family | 25 | 34.2% |
| Cohabiting couple | 4 | 5.5% |
| Male householder, no spouse | 20 | 27.4% |
| Female householder, no spouse | 24 | 32.9% |
| Households with children under 18 | 11 | 15.1% |
| Households with seniors (65+) | 32 | 43.8% |
| Average household size | 1.95 | |
Marital status
| Status | Male | Female |
|---|---|---|
| Never married | 40.3% | 22.4% |
| Married | 37.3% | 43.1% |
| Separated | 16.4% | 3.4% |
| Widowed | 0.0% | 25.9% |
| Divorced | 6.0% | 5.2% |
Education
Less than 9th grade
3.7%
Some HS, no diploma
0.0%
HS graduate
38.9%
Some college, no degree
21.3%
Associate's degree
15.7%
Bachelor's degree
20.4%
Graduate / professional
0.0%
| Metric | % |
|---|---|
| HS diploma or higher | 96.3% |
| Bachelor's or higher | 20.4% |
School enrollment (ages 3–17)
| Type | Count | % |
|---|---|---|
| Nursery / preschool | 0 | 0.0% |
| Kindergarten | 0 | 0.0% |
| Elementary school | 15 | 44.1% |
| High school | 12 | 35.3% |
| College / grad school | 7 | 20.6% |
Employment
Industry of employment
Agriculture & mining
47.3%
Education & healthcare
17.6%
Construction
9.5%
Transportation & utilities
8.1%
Arts, food & hospitality
5.4%
Retail trade
4.1%
Manufacturing
2.7%
Other services
2.7%
Professional & management
1.4%
Public administration
1.4%
Occupation
| Category | % |
|---|---|
| Management, business & arts | 59.5% |
| Service | 5.4% |
| Sales & office | 8.1% |
| Natural resources & construction | 16.2% |
| Production & transportation | 10.8% |
Employment type
| Type | % |
|---|---|
| Private sector | 31.1% |
| Government | 20.3% |
| Self-employed | 45.9% |
| Unpaid family workers | 2.7% |
Commute
| Method | % |
|---|---|
| Drive alone | 45.9% |
| Carpool | 9.5% |
| Public transit | 0.0% |
| Walk | 10.8% |
| Work from home | 33.8% |
| Other means | 0.0% |
| Avg commute (minutes) | 20.3 |
Poverty
All people
19.7%
Under 18 years
18.5%
18 and over
20.0%
Married-couple families
4.0%
Female-led households
22.2%
Income support
| Source | % of households |
|---|---|
| Social Security | 41.1% |
| Retirement income | 24.7% |
| Supplemental Security | 1.4% |
| Cash public assistance | 2.7% |
| Food stamps / SNAP | 6.8% |
Health indicators
| Condition | % |
|---|---|
| Obesity | 38.2% |
| High blood pressure | 41.3% |
| High cholesterol | 37.1% |
| Diabetes | 15.1% |
| Heart disease | 11.8% |
| Stroke | 5.7% |
| Asthma | 10.2% |
| Arthritis | 32.8% |
| Kidney disease | 4.8% |
| Pulmonary disease | 11.4% |
| Cancer | 8.8% |
| Behavior / access | % |
|---|---|
| Smoking | 24.2% |
| Binge drinking | 16.6% |
| No physical activity | 33.0% |
| Less than 7 hrs sleep | 29.2% |
| Depression | 17.3% |
| Fair or poor health | 21.1% |
| Poor mental health | 12.3% |
| Poor physical health | 14.1% |
| No health insurance | 14.0% |
| Visited doctor (checkup) | 75.7% |
| Visited dentist | 53.6% |
| Cholesterol screening | 87.6% |
| Teeth loss | 23.3% |
Veterans & disability
| Veterans | Count | % |
|---|---|---|
| Civilian veterans | 8 | 7.0% |
| Disability | % |
|---|---|
| Any disability | 15.5% |
| Under 18 | 0.0% |
| 18–64 years | 5.6% |
| 65 and over | 41.9% |
Health insurance coverage
| Type | % |
|---|---|
| Private insurance | 72.5% |
| Public insurance | 41.5% |
| No insurance | 8.5% |
| Uninsured under 19 | 33.3% |
Language & origin
Language spoken at home (age 5+)
| Language | Count | % |
|---|---|---|
| English only | 142 | 100.0% |
| 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) | 142 | 100.0% |
| Born in same state | 142 | 100.0% |
| Born in different state | 62 | 43.7% |
| Foreign born | 0 | 0.0% |
| Naturalized citizen | 0 | 0.0% |
| Not a US citizen | 0 | 0.0% |
Ancestry
| Ancestry | Count | % |
|---|---|---|
| Italian | 36 | 25.4% |
| Arab | 22 | 15.5% |
| Polish | 12 | 8.5% |
| Ancestry | Count | % |
|---|---|---|
| French | 6 | 4.2% |
| English | 4 | 2.8% |
| Dutch | 2 | 1.4% |
Technology access
| Metric | % of households |
|---|---|
| Computer access | 51.4% |
| Internet access | 86.3% |
Source: U.S. Census Bureau, American Community Survey 2025 estimates.
Frequently asked questions about ZIP code 57645
What city is ZIP code 57645 in?
ZIP code 57645 is primarily assigned to Morristown, South Dakota.
What county is ZIP code 57645 in?
ZIP code 57645 falls within Sioux County, South Dakota.
Does ZIP code 57645 have an older population?
30% of residents in ZIP code 57645 are 65 or older, above the national average of ~17%.
Is ZIP code 57645 mostly owner-occupied?
93% of occupied units in ZIP code 57645 are owner-occupied, well above the national average.
What is the poverty rate in ZIP code 57645?
20% of residents in ZIP code 57645 live below the poverty line, above the national average.
Does ZIP code 57645 have a large retiree population?
41% of households in ZIP code 57645 receive Social Security income, suggesting a significant retiree or disability population.
What timezone is ZIP code 57645 in?
ZIP code 57645 observes the MST timezone.