57779 ZIP Code — Saint Onge, SD
Lawrence County, South Dakota
ZIP code 57779 is located in Saint Onge, South Dakota, within Lawrence County. It covers approximately 41.06 square miles and serves a population of 267 residents. This is a standard ZIP code in the Mountain (MT) timezone, served by area code 605.
About ZIP code 57779
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 $245,700.
The dominant occupation class is management, business, and professional, with construction as the leading industry.
Educational attainment is high — 47% of residents hold a bachelor's degree or higher, well above the national average of 33%.
267
population
41.06
sq mi land
Standard
ZIP type
Mountain (MT)
timezone
57779 ZIP code map
Cities in ZIP code 57779
Below are the cities the US Postal Service accepts for ZIP code 57779. Using any city not on this list may result in mail delivery delays.
| City | Status |
|---|---|
| Saint Onge | Preferred |
Nearby ZIP codes
57799 Spearfish (6.5 mi)
57783 Spearfish (7.9 mi)
57793 Whitewood (9.1 mi)
57762 Nisland (13.6 mi)
82712 Beulah (19 mi)
57788 Vale (19.6 mi)
Demographics
updated 05/2026
| Population | |
|---|---|
| Total population | 267 |
| Population density | 7 / sq mi |
| State FIPS | 46 |
| County FIPS | 081 |
| Geography | |
|---|---|
| Land area | 41.06 sq mi |
| Water area | 0.04 sq mi |
| Latitude | 44.5468 |
| Longitude | -103.7585 |
| 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 | 16.0% | 47.8% | 41.7% |
| $50k – $100k | 0.0% | 29.1% | 33.8% |
| $100k – $200k | 0.0% | 18.3% | 20.1% |
| Over $200k | 84.0% | 4.8% | 4.4% |
Demographics & statistics
267
Population
7
People per sq mi
58.3
Median age
$0
Median household income
$81,441
Per capita income
$245,700
Median home value
$0
Median monthly rent
100.0%
Home ownership
0.0%
Poverty rate
0.0%
Unemployment
171
Housing units
46.8%
Bachelor's or higher
Age distribution
Male
Female
32
45–54
83
18
55–59
47
18
60–64
45
7
75–84
17
← Male
Female →
Age summary
| Group | Count | % |
|---|---|---|
| Under 18 | 0 | 0.0% |
| 18 and over | 267 | 100.0% |
| 65 and over | 24 | 9.0% |
| Median age | 58.3 years | |
Race & ethnicity
White
100%
| Group | Count | % |
|---|---|---|
| White | 267 | 100% |
Household income
| Income range | This ZIP | County avg | State avg |
|---|---|---|---|
| Under $50k | 16.0% | 47.8% | 41.7% |
| $50k – $100k | 0.0% | 29.1% | 33.8% |
| $100k – $200k | 0.0% | 18.3% | 20.1% |
| Over $200k | 84.0% | 4.8% | 4.4% |
$50k–$75k
50.7%
$100k–$150k
3.6%
$200k+
45.7%
| Range | % of households |
|---|---|
| $50k–$75k | 50.7% |
| $100k–$150k | 3.6% |
| $200k+ | 45.7% |
| Median income | $0 |
Housing
Home values
$150k–$200k
3.6%
$200k–$300k
96.4%
Housing overview
| Metric | Value |
|---|---|
| Median home value | $245,700 |
| Median rent / month | $0 |
| Owner occupied | 100.0% |
| Renter occupied | 0.0% |
| Vacant | 19.3% |
| Single-family detached | 100.0% |
| Large apartment buildings | 0.0% |
| Mobile homes | 0.0% |
| Median rooms | 10.0 |
| Avg household size (owned) | 1.93 |
Year built
| Era | % |
|---|---|
| 2020 or later | 0.0% |
| 2010–2019 | 36.8% |
| 2000–2009 | 0.0% |
| 1990–1999 | 0.0% |
| 1980–1989 | 0.0% |
| 1970–1979 | 4.1% |
| 1960–1969 | 0.0% |
| 1950–1959 | 19.3% |
| 1940–1949 | 0.0% |
| 1939 or earlier | 39.8% |
Bedrooms
| Size | % of units |
|---|---|
| No bedroom (studio) | 0.0% |
| 1 bedroom | 0.0% |
| 2 bedrooms | 19.3% |
| 3 bedrooms | 2.9% |
| 4 bedrooms | 77.8% |
| 5+ bedrooms | 0.0% |
Vehicles per household
| Vehicles | % of households |
|---|---|
| No vehicle | 0.0% |
| 1 vehicle | 0.0% |
| 2 vehicles | 50.7% |
| 3 or more | 49.3% |
Heating fuel
| Fuel type | % |
|---|---|
| Utility gas | 45.7% |
| Electricity | 5.1% |
| Propane / LP gas | 49.3% |
Households & families
| Household type | Count | % |
|---|---|---|
| Married-couple family | 138 | 100.0% |
| Cohabiting couple | 0 | 0.0% |
| Male householder, no spouse | 0 | 0.0% |
| Female householder, no spouse | 0 | 0.0% |
| Households with children under 18 | 0 | 0.0% |
| Households with seniors (65+) | 12 | 8.7% |
| Average household size | 1.93 | |
Marital status
| Status | Male | Female |
|---|---|---|
| Never married | 0.0% | 0.0% |
| Married | 100.0% | 100.0% |
| Separated | 0.0% | 0.0% |
| Widowed | 0.0% | 0.0% |
| Divorced | 0.0% | 0.0% |
Education
Less than 9th grade
0.0%
Some HS, no diploma
0.0%
HS graduate
28.8%
Some college, no degree
24.3%
Associate's degree
0.0%
Bachelor's degree
46.8%
Graduate / professional
0.0%
| Metric | % |
|---|---|
| HS diploma or higher | 100.0% |
| Bachelor's or higher | 46.8% |
School enrollment (ages 3–17)
| Type | Count | % |
|---|---|---|
| Nursery / preschool | 0 | 0.0% |
| Kindergarten | 0 | 0.0% |
| Elementary school | 0 | 0.0% |
| High school | 0 | 0.0% |
| College / grad school | 0 | 0.0% |
Employment
Industry of employment
Construction
35.4%
Wholesale trade
35.4%
Professional & management
29.2%
Occupation
| Category | % |
|---|---|
| Management, business & arts | 64.6% |
| Service | 0.0% |
| Sales & office | 35.4% |
| Natural resources & construction | 0.0% |
| Production & transportation | 0.0% |
Employment type
| Type | % |
|---|---|
| Private sector | 100.0% |
| Government | 0.0% |
| Self-employed | 0.0% |
| Unpaid family workers | 0.0% |
Commute
| Method | % |
|---|---|
| Drive alone | 100.0% |
| Carpool | 0.0% |
| Public transit | 0.0% |
| Walk | 0.0% |
| Work from home | 0.0% |
| Other means | 0.0% |
| Avg commute (minutes) | 0.0 |
Poverty
All people
0.0%
Under 18 years
0.0%
18 and over
0.0%
Married-couple families
0.0%
Female-led households
0.0%
Income support
| Source | % of households |
|---|---|
| Social Security | 8.7% |
| Retirement income | 3.6% |
| Supplemental Security | 0.0% |
| Cash public assistance | 0.0% |
| Food stamps / SNAP | 0.0% |
Health indicators
| Condition | % |
|---|---|
| Obesity | 27.7% |
| High blood pressure | 30.4% |
| High cholesterol | 30.8% |
| Diabetes | 8.6% |
| Heart disease | 6.9% |
| Stroke | 3.0% |
| Asthma | 8.5% |
| Arthritis | 25.5% |
| Kidney disease | 2.9% |
| Pulmonary disease | 5.6% |
| Cancer | 7.7% |
| Behavior / access | % |
|---|---|
| Smoking | 16.9% |
| Binge drinking | 20.7% |
| No physical activity | 20.1% |
| Less than 7 hrs sleep | 26.6% |
| Depression | 15.0% |
| Fair or poor health | 10.4% |
| Poor mental health | 10.2% |
| Poor physical health | 8.3% |
| No health insurance | 10.5% |
| Visited doctor (checkup) | 72.6% |
| Visited dentist | 69.6% |
| Cholesterol screening | 89.7% |
| Teeth loss | 12.6% |
Veterans & disability
| Veterans | Count | % |
|---|---|---|
| Civilian veterans | 0 | 0.0% |
| Disability | % |
|---|---|
| Any disability | 0.0% |
| Under 18 | 0.0% |
| 18–64 years | 0.0% |
| 65 and over | 0.0% |
Health insurance coverage
| Type | % |
|---|---|
| Private insurance | 94.8% |
| Public insurance | 9.0% |
| No insurance | 0.0% |
| Uninsured under 19 | 0.0% |
Language & origin
Language spoken at home (age 5+)
| Language | Count | % |
|---|---|---|
| English only | 267 | 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) | 267 | 100.0% |
| Born in same state | 267 | 100.0% |
| Born in different state | 127 | 47.6% |
| Foreign born | 0 | 0.0% |
| Naturalized citizen | 0 | 0.0% |
| Not a US citizen | 0 | 0.0% |
Ancestry
| Ancestry | Count | % |
|---|---|---|
| Italian | 128 | 47.9% |
Technology access
| Metric | % of households |
|---|---|
| Computer access | 51.7% |
| Internet access | 96.4% |
Source: U.S. Census Bureau, American Community Survey 2025 estimates.
Frequently asked questions about ZIP code 57779
What city is ZIP code 57779 in?
ZIP code 57779 is primarily assigned to Saint Onge, South Dakota.
What county is ZIP code 57779 in?
ZIP code 57779 falls within Lawrence County, South Dakota.
How educated is the population of ZIP code 57779?
47% 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 57779?
ZIP code 57779 has an estimated population of 267 residents, with a density of 7 people per square mile.
What is the typical home value in ZIP code 57779?
The median home value in ZIP code 57779 is $245,700.
What timezone is ZIP code 57779 in?
ZIP code 57779 observes the MST timezone.