Groton ZIP Codes — Brown County, SD

There is one unique ZIP code in Groton, South Dakota and it is 57445. Area code: 605.
1
ZIP codes
253.91
sq mi land
0.09
sq mi water
605
area code
Groton, SD ZIP code map

About Groton, SD

Groton is a small yet vibrant city located in South Dakota, known for its welcoming community and rich agricultural backdrop. Nestled in Brown County, Groton serves as both a residential area and a hub for local commerce. The city offers a blend of rural charm and modern amenities for residents and visitors alike.

Location & geography

Situated in the north-central region of South Dakota, Groton spans a total land area of 253.91 square miles with a minor water area of 0.09 square miles. The city lies approximately 20 miles east of Aberdeen, 28 miles north of Redfield, and about 40 miles south of the North Dakota border. The surrounding terrain is primarily flat and well-suited for agriculture, typical of the scenic plains in this part of the state.

Community & economy

Groton is a tight-knit community characterized by its friendly residents and a strong sense of local pride. The primary industry in the area is agriculture, with many community members engaged in farming and related enterprises. Daily life in Groton often revolves around local events, schools, and gatherings that foster connections among its residents.

Transportation

Groton is accessible via South Dakota Highway 37, which provides a vital connection to larger cities in the region. The nearest named airport is Aberdeen Regional Airport, located about 20 miles to the west, offering commercial flights. Public transportation options are limited, making personal vehicles the primary mode of travel for residents.

History

Groton was originally founded in the late 19th century, developing rapidly as a result of the expansion of agricultural opportunities in the area. The city has historically been significant for its grain production and serves as a center for agricultural services in Brown County. Notable events include the establishment of the local fair, which showcases the community's rich agricultural heritage.

Did you know?

An interesting fact about Groton is that it is home to the annual Groton Community Fair, which celebrates local agriculture and crafts while bringing together residents and visitors. Additionally, the city boasts a strong presence of local organizations focused on preserving its history and promoting community development.

ZIP codes for Groton, SD (1)
ZIP code City County Map
57445 Groton Brown View map

Demographics & statistics

1,910
Population
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

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%
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%
High blood pressure34.0%
High cholesterol33.4%
Heart disease7.0%
Stroke3.1%
Asthma8.0%
Arthritis26.8%
Kidney disease3.0%
Pulmonary disease5.6%
Cancer8.1%
Behavior / access%
Binge drinking19.3%
No physical activity23.3%
Less than 7 hrs sleep28.6%
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%
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
What ZIP codes does Groton, SD have?
Groton, SD has one ZIP code: 57445. Each ZIP code serves a distinct delivery area within the city and surrounding region.
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