57445 ZIP Code — Groton, SD

Brown County, South Dakota

ZIP code 57445 is located in Groton, South Dakota, within Brown County. It covers approximately 253.91 square miles and serves a population of 1,910 residents. This is a standard ZIP code in the Central (CT) timezone, served by area code 605.

About ZIP code 57445

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 $173,700. Owner-occupancy is high at 79%, well above the national average.

Median household income is $81,964. The poverty rate of 4% 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 17 minutes is near the national average.

Educational attainment is near the national average, with 21% of residents holding a bachelor's degree or higher.

1,910
population
253.91
sq mi land
Standard
ZIP type
Central (CT)
timezone
57445 ZIP code map
Cities in ZIP code 57445

Below are the cities the US Postal Service accepts for ZIP code 57445. Using any city not on this list may result in mail delivery delays.

City Status
Groton Acceptable
Groton Preferred
Nearby ZIP codes
57427 Bath (8.6 mi) 57422 Andover (11.1 mi) 57433 Columbia (13.9 mi) 57479 Warner (17.1 mi) 57468 Pierpont (17.1 mi) 57432 Claremont (17.6 mi) 57401 Aberdeen (18.6 mi) 57434 Conde (19.4 mi)
Demographics updated 05/2026
Population
Total population 1,910
Population density 8 / sq mi
State FIPS 46
County FIPS 013
Geography
Land area 253.91 sq mi
Water area 0.09 sq mi
Latitude 45.4618
Longitude -98.1445
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 33.7% 39.9% 41.7%
$50k – $100k 34.8% 34.8% 33.8%
$100k – $200k 28.0% 20.4% 20.1%
Over $200k 3.4% 4.9% 4.4%

Demographics & statistics

1,910
Population
8
People per sq mi
37.1
Median age
$81,964
Median household income
$40,037
Per capita income
$173,700
Median home value
$920
Median monthly rent
78.9%
Home ownership
4.2%
Poverty rate
2.6%
Unemployment
736
Housing units
21.1%
Bachelor's or higher

Age distribution

Male Female
44
Under 5
41
50
5–9
46
114
10–14
103
59
15–19
54
37
20–24
33
168
25–34
154
105
35–44
96
113
45–54
103
70
55–59
64
42
60–64
39
113
65–74
103
47
75–84
43
36
85+
33
← Male
Female →

Age summary

GroupCount%
Under 1849125.7%
18 and over1,41974.3%
65 and over37519.6%
Median age37.1 years

Race & ethnicity

White 94.9%
Two or more races 2.1%
Hispanic or Latino 2%
Other race 1.1%
GroupCount%
White1,84994.9%
Two or more races402.1%
Hispanic or Latino382%
Other race211.1%

Household income

Income range This ZIP County avg State avg
Under $50k 33.7% 39.9% 41.7%
$50k – $100k 34.8% 34.8% 33.8%
$100k – $200k 28.0% 20.4% 20.1%
Over $200k 3.4% 4.9% 4.4%
Under $10k 2.7%
$10k–$15k 0.9%
$15k–$25k 7.4%
$25k–$35k 10.5%
$35k–$50k 9.8%
$50k–$75k 15.1%
$75k–$100k 16.4%
$100k–$150k 16.4%
$150k–$200k 13.3%
$200k+ 7.5%
Range% of households
Under $10k2.7%
$10k–$15k0.9%
$15k–$25k7.4%
$25k–$35k10.5%
$35k–$50k9.8%
$50k–$75k15.1%
$75k–$100k16.4%
$100k–$150k16.4%
$150k–$200k13.3%
$200k+7.5%
Median income$81,964

Housing

Home values

Under $50k 7.0%
$50k–$100k 8.7%
$100k–$150k 24.1%
$150k–$200k 17.0%
$200k–$300k 21.9%
$300k–$500k 18.0%
$500k–$1M 2.6%
$1M+ 0.7%

Housing overview

MetricValue
Median home value$173,700
Median rent / month$920
Owner occupied78.9%
Renter occupied21.1%
Vacant13.9%
Single-family detached71.0%
Large apartment buildings0.7%
Mobile homes10.6%
Median rooms6.4
Avg household size (owned)2.61

Year built

Era%
2020 or later0.0%
2010–201911.8%
2000–200915.0%
1990–199913.6%
1980–19894.9%
1970–197912.2%
1960–19697.2%
1950–19598.3%
1940–19493.2%
1939 or earlier23.7%

Bedrooms

Size% of units
No bedroom (studio)0.0%
1 bedroom2.2%
2 bedrooms28.8%
3 bedrooms34.6%
4 bedrooms24.1%
5+ bedrooms10.2%

Vehicles per household

Vehicles% of households
No vehicle3.5%
1 vehicle26.4%
2 vehicles24.7%
3 or more45.5%

Heating fuel

Fuel type%
Utility gas49.9%
Electricity35.7%
Propane / LP gas12.8%
Fuel oil0.9%

Households & families

Household typeCount%
Married-couple family39150.5%
Cohabiting couple536.8%
Male householder, no spouse17322.4%
Female householder, no spouse15720.3%
Households with children under 1824731.9%
Households with seniors (65+)22629.2%
Average household size2.41

Marital status

StatusMaleFemale
Never married26.5%24.7%
Married55.6%53.7%
Separated0.0%0.3%
Widowed3.4%13.1%
Divorced14.5%8.3%

Education

Less than 9th grade 2.2%
Some HS, no diploma 1.7%
HS graduate 34.4%
Some college, no degree 24.2%
Associate's degree 16.4%
Bachelor's degree 13.9%
Graduate / professional 7.2%
Metric%
HS diploma or higher96.1%
Bachelor's or higher21.1%

School enrollment (ages 3–17)

TypeCount%
Nursery / preschool81.7%
Kindergarten183.8%
Elementary school25654.7%
High school12827.4%
College / grad school5812.4%

Employment

Industry of employment

Education & healthcare 30.1%
Retail trade 14.8%
Manufacturing 12.6%
Agriculture & mining 9.0%
Finance & real estate 7.3%
Construction 6.9%
Other services 4.4%
Arts, food & hospitality 3.6%
Transportation & utilities 2.8%
Professional & management 2.6%
Wholesale trade 2.5%
Public administration 2.5%
Information 1.1%

Occupation

Category%
Management, business & arts36.9%
Service16.1%
Sales & office16.1%
Natural resources & construction12.8%
Production & transportation18.1%

Employment type

Type%
Private sector75.7%
Government12.0%
Self-employed11.8%
Unpaid family workers0.5%

Commute

Method%
Drive alone90.2%
Carpool4.0%
Public transit0.0%
Walk3.0%
Work from home2.8%
Other means0.0%
Avg commute (minutes)16.7

Poverty

All people 4.2%
Under 18 years 3.1%
18 and over 4.6%
Married-couple families 0.0%
Female-led households 35.9%

Income support

Source% of households
Social Security28.8%
Retirement income19.1%
Supplemental Security1.6%
Cash public assistance1.6%
Food stamps / SNAP2.5%

Health indicators

Condition%
Obesity32.2%
High blood pressure34.0%
High cholesterol33.4%
Diabetes9.3%
Heart disease7.0%
Stroke3.1%
Asthma8.0%
Arthritis26.8%
Kidney disease3.0%
Pulmonary disease5.6%
Cancer8.1%
Behavior / access%
Smoking16.8%
Binge drinking19.3%
No physical activity23.3%
Less than 7 hrs sleep28.6%
Depression15.4%
Fair or poor health10.4%
Poor mental health9.9%
Poor physical health8.4%
No health insurance11.0%
Visited doctor (checkup)76.1%
Visited dentist70.3%
Cholesterol screening90.3%
Teeth loss12.6%

Veterans & disability

VeteransCount%
Civilian veterans815.7%
Disability%
Any disability10.0%
Under 181.2%
18–64 years6.9%
65 and over33.0%

Health insurance coverage

Type%
Private insurance87.0%
Public insurance23.3%
No insurance5.5%
Uninsured under 194.5%

Language & origin

Language spoken at home (age 5+)

LanguageCount%
English only1,82595.5%
Spanish241.3%
Other Indo-European241.3%
Asian & Pacific Islander00.0%
Other languages00.0%

Place of birth & citizenship

OriginCount%
Native born (US)1,89099.0%
Born in same state1,88398.6%
Born in different state1,55581.4%
Foreign born70.4%
Naturalized citizen201.0%
Not a US citizen00.0%

Ancestry

AncestryCount%
Polish44823.5%
Italian1729%
French1688.8%
Arab693.6%
AncestryCount%
German241.3%
English80.4%
Dutch20.1%

Technology access

Metric% of households
Computer access40.5%
Internet access89.0%

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

Frequently asked questions about ZIP code 57445

What city is ZIP code 57445 in?

ZIP code 57445 is primarily assigned to Groton, South Dakota.

What county is ZIP code 57445 in?

ZIP code 57445 falls within Brown County, South Dakota.

What is the typical home value in ZIP code 57445?

The median home value in ZIP code 57445 is $173,700.

What is the population of ZIP code 57445?

ZIP code 57445 has an estimated population of 1,910 residents, with a density of 8 people per square mile.

What is the median household income in ZIP code 57445?

The median household income in ZIP code 57445 is $81,964, above the national median of ~$75,000.

What timezone is ZIP code 57445 in?

ZIP code 57445 observes the CST timezone.

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