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Interior, SDPhoto: Jared Winkler · CC BY-SA 4.0
The Interior handbook

Living in Interior, SD: what to set up and who to call

Power in Interior comes from West River Electric Assn, a cooperative utility rather than a private company. For an emergency, Hans P Peterson Memorial Hospital - Cah is the closest ER, 26.4 miles away.

Which school will my kid attend?How do I register to vote?ZIP codes

I’m new in town

What to set up in Interior, and who provides it. Tap an answer for the details and where they come from.

PowerWest River Electric Assncooperative utility · 15.2¢/kWhMore →Internet1 providers100% of addresses get 100/20 MbpsMore →Trash & dumpNot on file yetWe don’t have Interior’s trash rules yetMore →SchoolKadoka School District 35-2Which school depends on grade and addressMore →Register to voteIn personRules from vote.govMore →ZIP code57750Where people live, not P.O. boxesMore →
Home services

Power, water and internet

Who to call to start service at a new address in Interior.

Electricity

Power comes from West River Electric Assn

West River Electric Assn (West River Electric Assn Inc), a cooperative utility, serves all of Interior. Its homes paid an average of 15.2¢ per kWh in 2025, about $136 a month (its average across South Dakota).

Start or move service: westriver.com · (605) 279-2135

Service territory: HIFLD Electric Retail Service Territories (map dated Aug 2023). Prices and customers: EIA-861, 2025.

Internet

1 home internet providers serve Interior

100% of 47 addresses can get 100/20 Mbps; 100% can get fiber.

ProviderTechnologyAddressesFastest (Mbps)
Golden West TelecommunicationsFiber100%1,000/1,000

FCC National Broadband Map, as of December 2025. Availability as providers report it, not speeds people get.

Trash & recycling

We don’t have Interior’s trash rules yet

Pickup rules, the dump and recycling in Interior.

Trash, recycling and bulk pickupNot on fileOpenStreetMap lists no public drop-off in Interior or within 5 miles (as of Oct 9, 2026); map coverage varies by town.
Schools

Where your child goes to school

Public school districts and the school path by grade.

Interior kids go to
K–8Interior Elementary - 09Kadoka School District 35-2
9–12Kadoka Area High School - 01in Kadoka

Interior is in Kadoka School District 35-2.

Test scores and every school: see Schools →

U.S. Department of Education, NCES Common Core of Data, 2024–25. Enrollment rules and registration are the district’s.

Government & voting

Town hall and registering to vote

Who to call, and how to register.

Town HallBudget, officials, electionsInterior’s government in one page
Who runs elections hereJackson County AuditorElections here are run by Jackson County (county election office). PO Box 280, Kadoka, SD 57543-0280 · (605) 837-2422 · [email protected]FVAP, Jul 2023
Register to voteIn personSouth Dakota has no online registration; you can register in person until 15 days before Election Day or by mail (received 15 days before).vote.govCheck your registration and polling placevip.sdsos.govThe state’s voter lookup

Election office: FVAP local election office directory, updated Jul 2023; jurisdictions: EAC EAVS 2024. Registration rules and links: vote.gov, updated Aug 3, 2026.

ZIP codes & area codes

Interior is in ZIP code 57750

ZIP codes where Interior residents live, with the share of the town in each.

ZIPPost office nameShare of InteriorZIP’s residents in Interior
57750Interior, SD100%16%
Area code605Wikidata

Census 2020 ZIP Code Tabulation Areas, by census block; post office names: GeoNames (CC BY 4.0). ZIPs created since 2020 are missing.

Everyday places

Getting around, the ER and the library

One line each; the subject pages have the rest.

Nearest emergency roomHans P Peterson Memorial Hospital - Cah26.4 miles awayGet a library cardWall Community Library407 Main St. · (605) 279-2929

ER: CMS hospital data. Library: IMLS Public Libraries Survey, FY2024.

Questions about living in Interior

Who provides electricity in Interior?

West River Electric Assn (West River Electric Assn Inc), a cooperative utility. Its homes paid about 15.2¢ per kWh in 2025 (EIA).

What internet providers serve Interior?

Golden West Telecommunications (FCC, as of December 2025).

What ZIP codes are in Interior?

57750. Census 2020 ZIP Code Tabulation Areas.

What school district is Interior in?

Kadoka School District 35-2.

How do I register to vote in Interior?

South Dakota has no online registration; you can register in person until 15 days before Election Day or by mail (received 15 days before). Elections here are run by the Jackson County Auditor. Check your registration at vip.sdsos.gov.

Sources & dates

Every answer above names its source. Here they are with their dates.

  • Power: HIFLD Electric Retail Service Territories (map Aug 2023); EIA-861 final 2025.
  • Trash: OpenStreetMap, Geofabrik extract of Oct 9, 2026. © OpenStreetMap contributors (ODbL).
  • ZIP codes: Census 2020 ZCTA relationship files; GeoNames postal codes (CC BY 4.0).
  • Schools: NCES Common Core of Data, 2024–25.
  • Registration: vote.gov, updated Aug 3, 2026 (read Oct 10, 2026). Official sites and area codes: Wikidata.
  • Election office: FVAP local election office directory (fetched Oct 10, 2026; each record dated), EAC EAVS 2024 jurisdictions; registration and lookup links from vote.gov’s state data, checked Oct 10, 2026.
  • Internet: FCC National Broadband Map, as of December 2025.