Groton is a city in Brown County, South Dakota, home to about 1,691 people across 1.8 square miles. Its ZIP code is 57445.
Mostly Groton
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| Nearest major airport | Minneapolis–Saint Paul International Airport / Wold–Chamberlain Field (MSP)241 miles away |
|---|---|
| Closer regional airport | Aberdeen Regional Airport (ABR)15 miles away |
| Nearest city of 250,000+ | Minneapolis, MN238 miles away |
| Nearest city of 1 million+ | Chicago, IL577 miles away |
Straight-line distances from the center of Groton; driving is longer.
Source: Airports from OurAirports (scheduled passenger service); city centers and populations from the U.S. Census Bureau.
Source: Members of Congress from the congress-legislators project; districts from the Census Bureau’s relationship files; governor and mayor from Wikidata.
Groton had 1,380 residents in the 2020 census, up 2% since 2000.
It’s the 48th largest of 440 towns in South Dakota by population.
Brown County grew from 15,286 residents in 1900 to 38,301 in 2020.
Brown County, 1900–2020
Source: U.S. Census Bureau decennial censuses (counties 1900–1990 from the Bureau’s historical county file).
Average highs peak around 82°F in summer, and winter lows average 5°F. About 24 inches of rain and melted snow fall in a typical year.
Source: NOAA 1991–2020 climate normals, Andover #2, SD weather station (10 miles away).
17,306 jobs at 1,245 businesses in Brown County. The biggest industries by employees:
Source: U.S. Census Bureau County Business Patterns 2023 (private employers; jobs counted where people work).
8 doctors and other health care providers list an office in Groton.
Nearest hospitals
Providers with an office here
| Nurse practitioners and physician assistants | 2 |
|---|---|
| Mental health providers | 2 |
| Physical and occupational therapists | 3 |
| Chiropractors | 1 |
| Pharmacies | 1 |
Source: Hospitals from CMS Hospital General Information (ratings are CMS overall star ratings); straight-line distances; providers from the CMS National Plan and Provider Enumeration System (NPPES), by practice address and primary specialty.
Parks (2 nearby)
Grocery stores (1 nearby)
Pharmacies (1 nearby)
Libraries (1 nearby)
Counts are within about 1 mile of the center of town.
Source: Map data © OpenStreetMap contributors (openstreetmap.org/copyright), as mapped by volunteers; it can miss places or include closed ones.
Public schools here are run by Groton Area School District 06-6. Check each district’s attendance zones for a specific address.
| School | Grades | Students | Type | Distance |
|---|---|---|---|---|
| Groton Area Elementary - 02Groton | Pre-K–5 | 278 | Public | 0.3 mi |
| Groton Area Middle School - 04Groton | 6–8 | 132 | Public | 0.2 mi |
| Groton Area High School - 01Groton | 9–12 | 168 | Public | 0.2 mi |
Source: U.S. Department of Education, NCES: Common Core of Data (2024-2025) for public schools. Listed by address; we don’t rate schools.
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Town boundaries don’t always match ZIP codes: a ZIP code can cross into neighboring towns, and a town can share a ZIP code with its neighbors. Facts describe the town itself; market figures describe whole ZIP codes.