Eureka is a city in western McPherson County, South Dakota, United States, near the North Dakota state line. The population was 813 at the 2020 census.

Official town website ↗

From Wikipedia, licensed CC BY-SA 4.0 · facts via Wikidata (CC0)

Town numbers

ZIP code57437

Area code605

Living in Eureka

Work & commute in Eureka

Full picture →

About one in 5 of Eureka’s working residents works in town. The top destinations are Aberdeen (15%), Leola (11%) and Sioux Falls (5%). Half commute less than 36 miles.

Aberdeen

15%

Leola

11%

Sioux Falls

Ipswich

21%Work in townlive and work in Eureka 36 miWhere do people commute?the commute map 243Jobs based herebalanced

Census LEHD 2023 · ACSWork & commute in Eureka →

Health in Eureka

Compared with South Dakota

5better than SD·12worse

of 26 measures CDC estimates. The other 9 are too close to call.

Conditions 9▼ 3 close Habits 1▲ 1▼ 2 close Care 3▲ 4 close Mind 1▲ 2▼ 0 close

BetterToo close to callWorse

What stands out

12.3%Fewer binge drinkersSD 18.8% · better 12.7%Fewer adults in frequent mental distressSD 15.3% · better 12.5%More adults with heart diseaseSD 6.8% · worse

Care nearby

Eureka Community Health Services - CahEureka · 0.5 mi · ER · rural critical access

Horizon Health - AberdeenAberdeen · 60 mi · sliding-scale fees

Primary careShortage · county-wide

DentalShortage · county-wide

Mental healthShortage · county-wide

CDC PLACES 2025 · modeled estimates for adults · CDC's estimate for Eureka · CMS · HRSAHealth in Eureka →

Natural hazards in Eureka

Low

Expected storm and flood damage is higher than in 37% of U.S. communities.

🥶 Cold waves🌊 Inland flooding🧊 Hail

0Does Eureka flood?no paid flood claims on record 3Disasters that paid out herefederal disasters sent FEMA money to Eureka

FEMA National Risk Index December 2025 · OpenFEMANatural hazards in Eureka →

Climate in Eureka

Full climate →

Eureka has cold, snowy winters and pleasant summers, with very little rain. A typical July afternoon reaches 83°, a January night drops to 3°, and about 44 inches of snow falls in a normal winter.

25° / 6°Winter

53° / 30°Spring

80° / 56°Summer

56° / 33°Fall

How much snow does Eureka get?About 44 inches a winter.Rain & snow →When is the first frost?Around Sep 27, with the last in spring around May 12.Frost dates →Is it warmer than it used to be?+0.7° vs. the 20th century.Then & now →

NOAA U.S. Climate Normals, 1991–2020Climate in Eureka →

Schools in Eureka

All Eureka schools →

School Grade A

The public schools Eureka’s kids attend outperform 92% of South Dakota’s districts on state tests. Among towns with similar incomes, they rank near the top.

DistrictEureka School District 44-1Schools3

Eureka Elementary - 02 A+Elementary · Grades PK–6 · 94 students Eureka Jr. High - 03 DMiddle · Grades 7–8 · 26 students Eureka High School - 01 B-High · Grades 9–12 · 43 students

School data from the U.S. Department of Education (NCES, EDFacts). The School Grade is our own summary of state test results, graded within SD. Ratings are from neighbors.