57031 ZIP Code — Gayville, SD

Yankton County, South Dakota

ZIP code 57031 is located in Gayville, South Dakota, within Yankton County. It covers approximately 39.36 square miles and serves a population of 766 residents. This is a standard ZIP code in the Central (CT) timezone, served by area code 605.

About ZIP code 57031

The housing stock consists of predominantly single-family detached homes. Most homes were built in the 1960s, giving the area an established character. Median home value is $136,400. Owner-occupancy is high at 91%, well above the national average.

The gap between median ($61,875) and mean household income suggests income inequality — a small number of higher earners pull the average up. The poverty rate of 2% is below the national average.

The dominant occupation class is management, business, and professional, with manufacturing as the leading industry. The average commute of 18 minutes is near the national average.

College attainment at 15% is below the national average, consistent with a trades and production-oriented local economy.

Overall, ZIP code 57031 reflects a community defined by a trades-oriented workforce and high homeownership.

766

population

39.36

sq mi land

Standard

ZIP type

Central (CT)

timezone

57031 ZIP code map

Cities in ZIP code 57031

Below are the cities the US Postal Service accepts for ZIP code 57031. Using any city not on this list may result in mail delivery delays.

City	Status
Gayville	Preferred

Nearby ZIP codes

68774 Saint Helena (6.7 mi) 57046 Mission Hill (8.9 mi) 57072 Volin (9 mi) 68736 Fordyce (9.8 mi) 68792 Wynot (10 mi) 57069 Vermillion (10.6 mi) 57073 Wakonda (12.5 mi) 57078 Yankton (14 mi) 68739 Hartington (16.3 mi) 57037 Irene (17 mi) 57014 Centerville (19.5 mi) 68730 Crofton (19.6 mi)

Demographics updated 05/2026

Population
Total population	766
Population density	19 / sq mi
State FIPS	46
County FIPS	135

Geography
Land area	39.36 sq mi
Water area	1.12 sq mi
Latitude	42.8619
Longitude	-97.2003
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	24.6%	40.5%	41.7%
$50k – $100k	55.5%	38.4%	33.8%
$100k – $200k	19.2%	17.1%	20.1%
Over $200k	0.7%	4.0%	4.4%

Demographics & statistics

766

Population

People per sq mi

42.8

Median age

$61,875

Median household income

$52,920

Per capita income

$136,400

Median home value

$521

Median monthly rent

91.2%

Home ownership

2.2%

Poverty rate

0.0%

Unemployment

378

Housing units

15.3%

Bachelor's or higher

Age distribution

Male Female

Under 5

5–9

10–14

15–19

20–24

25–34

105

35–44

45–54

55–59

60–64

65–74

75–84

85+

← Male

Female →

Age summary

Group	Count	%
Under 18	136	17.8%
18 and over	630	82.2%
65 and over	134	17.5%
Median age	42.8 years

Race & ethnicity

White 90.7%

Hispanic or Latino 3.5%

Other race 3.5%

Two or more races 1.5%

American Indian / Alaska Native 0.5%

Asian 0.3%

Group	Count	%
White	720	90.7%
Hispanic or Latino	28	3.5%
Other race	28	3.5%
Two or more races	12	1.5%
American Indian / Alaska Native	4	0.5%
Asian	2	0.3%

Household income

Income range	This ZIP	County avg	State avg
Under $50k	24.6%	40.5%	41.7%
$50k – $100k	55.5%	38.4%	33.8%
$100k – $200k	19.2%	17.1%	20.1%
Over $200k	0.7%	4.0%	4.4%

Under $10k 0.8%

$10k–$15k 0.8%

$15k–$25k 1.0%

$25k–$35k 9.5%

$35k–$50k 9.0%

$50k–$75k 35.6%

$75k–$100k 15.3%

$100k–$150k 17.5%

$150k–$200k 3.8%

$200k+ 6.8%

Range	% of households
Under $10k	0.8%
$10k–$15k	0.8%
$15k–$25k	1.0%
$25k–$35k	9.5%
$35k–$50k	9.0%
$50k–$75k	35.6%
$75k–$100k	15.3%
$100k–$150k	17.5%
$150k–$200k	3.8%
$200k+	6.8%
Median income	$61,875

Housing

Home values

Under $50k 7.1%

$50k–$100k 20.3%

$100k–$150k 45.6%

$150k–$200k 17.3%

$200k–$300k 7.1%

$300k–$500k 1.6%

$500k–$1M 0.8%

Housing overview

Metric	Value
Median home value	$136,400
Median rent / month	$521
Owner occupied	91.2%
Renter occupied	8.8%
Vacant	3.4%
Single-family detached	92.5%
Large apartment buildings	0.0%
Mobile homes	1.5%
Median rooms	6.2
Avg household size (owned)	1.98

Year built

Era	%
2020 or later	0.0%
2010–2019	0.5%
2000–2009	5.1%
1990–1999	8.7%
1980–1989	5.8%
1970–1979	16.7%
1960–1969	27.4%
1950–1959	6.3%
1940–1949	2.4%
1939 or earlier	27.1%

Bedrooms

Size	% of units
No bedroom (studio)	0.2%
1 bedroom	4.8%
2 bedrooms	38.0%
3 bedrooms	32.2%
4 bedrooms	17.4%
5+ bedrooms	7.3%

Vehicles per household

Vehicles	% of households
No vehicle	0.5%
1 vehicle	42.9%
2 vehicles	25.8%
3 or more	30.8%

Heating fuel

Fuel type	%
Utility gas	48.1%
Electricity	15.0%
Propane / LP gas	36.1%
Fuel oil	0.8%

Households & families

Household type	Count	%
Married-couple family	151	37.8%
Cohabiting couple	20	5.0%
Male householder, no spouse	167	41.9%
Female householder, no spouse	61	15.3%
Households with children under 18	50	12.5%
Households with seniors (65+)	106	26.6%
Average household size	1.92

Marital status

Status	Male	Female
Never married	45.7%	17.7%
Married	37.1%	60.2%
Separated	0.7%	0.0%
Widowed	1.0%	14.2%
Divorced	15.5%	7.9%

Education

Less than 9th grade 1.0%

Some HS, no diploma 3.4%

HS graduate 28.1%

Some college, no degree 22.0%

Associate's degree 30.3%

Bachelor's degree 11.3%

Graduate / professional 4.0%

Metric	%
HS diploma or higher	95.6%
Bachelor's or higher	15.3%

School enrollment (ages 3–17)

Type	Count	%
Nursery / preschool	6	4.8%
Kindergarten	4	3.2%
Elementary school	62	49.2%
High school	46	36.5%
College / grad school	8	6.3%

Employment

Industry of employment

Finance & real estate 25.0%

Manufacturing 23.6%

Education & healthcare 13.6%

Retail trade 9.2%

Agriculture & mining 7.9%

Construction 5.5%

Transportation & utilities 4.5%

Public administration 3.7%

Other services 3.1%

Wholesale trade 2.0%

Arts, food & hospitality 1.6%

Information 0.4%

Occupation

Category	%
Management, business & arts	44.4%
Service	6.1%
Sales & office	19.1%
Natural resources & construction	4.7%
Production & transportation	25.7%

Employment type

Type	%
Private sector	78.2%
Government	10.0%
Self-employed	11.8%
Unpaid family workers	0.0%

Commute

Method	%
Drive alone	83.9%
Carpool	5.9%
Public transit	0.0%
Walk	1.4%
Work from home	7.9%
Other means	1.0%
Avg commute (minutes)	18.1

Poverty

All people 2.2%

Under 18 years 3.9%

18 and over 1.9%

Married-couple families 0.7%

Female-led households 0.0%

Income support

Source	% of households
Social Security	27.6%
Retirement income	12.5%
Supplemental Security	4.8%
Cash public assistance	0.0%
Food stamps / SNAP	1.8%

Health indicators

Condition	%
Obesity	36.9%
High blood pressure	29.3%
High cholesterol	28.2%
Diabetes	8.1%
Heart disease	6.3%
Stroke	2.8%
Asthma	8.8%
Arthritis	21.7%
Kidney disease	2.6%
Pulmonary disease	5.5%
Cancer	6.8%

Behavior / access	%
Smoking	18.6%
Binge drinking	20.9%
No physical activity	22.1%
Less than 7 hrs sleep	29.1%
Depression	15.7%
Fair or poor health	10.7%
Poor mental health	10.9%
Poor physical health	8.3%
No health insurance	11.9%
Visited doctor (checkup)	74.9%
Visited dentist	68.7%
Cholesterol screening	88.2%
Teeth loss	14.0%

Veterans & disability

Veterans	Count	%
Civilian veterans	44	7.0%

Disability	%
Any disability	9.9%
Under 18	0.7%
18–64 years	6.9%
65 and over	30.6%

Health insurance coverage

Type	%
Private insurance	89.2%
Public insurance	22.1%
No insurance	3.3%
Uninsured under 19	10.8%

Language & origin

Language spoken at home (age 5+)

Language	Count	%
English only	741	96.7%
Spanish	8	1.1%
Other Indo-European	8	1.1%
Asian & Pacific Islander	0	0.0%
Other languages	0	0.0%

Place of birth & citizenship

Origin	Count	%
Native born (US)	742	96.9%
Born in same state	741	96.7%
Born in different state	574	74.9%
Foreign born	1	0.1%
Naturalized citizen	24	3.1%
Not a US citizen	19	79.2%

Ancestry

Ancestry	Count	%
Polish	148	19.3%
Dutch	80	10.4%
English	73	9.5%
Italian	45	5.9%

Ancestry	Count	%
French	21	2.7%
Arab	10	1.3%
German	3	0.4%

Technology access

Metric	% of households
Computer access	52.1%
Internet access	94.0%

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

Frequently asked questions about ZIP code 57031

What city is ZIP code 57031 in?

ZIP code 57031 is primarily assigned to Gayville, South Dakota.

What county is ZIP code 57031 in?

ZIP code 57031 falls within Yankton County, South Dakota.

Is ZIP code 57031 mostly owner-occupied?

91% of occupied units in ZIP code 57031 are owner-occupied, well above the national average.

What is the typical home value in ZIP code 57031?

The median home value in ZIP code 57031 is $136,400.

What is the population of ZIP code 57031?

ZIP code 57031 has an estimated population of 766 residents, with a density of 19 people per square mile.

What is the median household income in ZIP code 57031?

The median household income in ZIP code 57031 is $61,875, below the national median of ~$75,000.

What timezone is ZIP code 57031 in?

ZIP code 57031 observes the CST timezone.