| Eureka | |
| Official Name: | City of Eureka |
| Settlement Type: | City |
| Mapsize: | 275px |
| Subdivision Type: | Country |
| Subdivision Name: | United States |
| Subdivision Type1: | State |
| Subdivision Name1: | South Dakota |
| Subdivision Type2: | County |
| Subdivision Name2: | McPherson |
| Leader Title: | Mayor |
| Leader Name: | Wendy Brockel |
| Established Title: | Platted |
| Established Date: | October 3, 1887 |
| Established Title1: | Incorporated |
| Established Date1: | 1892[1] |
| Unit Pref: | Imperial |
| Area Footnotes: | [2] |
| Area Total Km2: | 2.59 |
| Area Land Km2: | 2.42 |
| Area Water Km2: | 0.17 |
| Area Total Sq Mi: | 1.00 |
| Area Land Sq Mi: | 0.93 |
| Area Water Sq Mi: | 0.07 |
| Population As Of: | 2020 |
| Population Est: | 794 |
| Pop Est As Of: | 2022 |
| Population Total: | 813 |
| Population Density Km2: | 336.45 |
| Population Density Sq Mi: | 871.38 |
| Timezone: | Central (CST) |
| Utc Offset: | -6 |
| Timezone Dst: | CDT |
| Utc Offset Dst: | -5 |
| Coordinates: | 45.7708°N -99.6206°W |
| Elevation M: | 575 |
| Elevation Ft: | 1887 |
| Postal Code Type: | ZIP code |
| Postal Code: | 57437 |
| Area Code: | 605 |
| Blank Name: | FIPS code |
| Blank Info: | 46-20180 |
| Blank1 Name: | GNIS feature ID |
| Blank1 Info: | 1267384 |
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.[3]
Eureka was laid out in 1887, and named "Eureka", a Greek exclamation meaning "I have found it!"[4]
According to the United States Census Bureau, the city has a total area of 1sqmi, of which 0.93sqmi is land and 0.07sqmi is water.[5]
As of the census of 2020, there were 813 people.
As of the census of 2010, there were 868 people, 452 households, and 240 families living in the city. The population density was 933.3PD/sqmi. There were 649 housing units at an average density of 697.8/sqmi. The racial makeup of the city was 98.2% White, 0.2% Asian, and 1.6% from two or more races. Hispanic or Latino people of any race were 1.2% of the population.
There were 452 households, of which 13.9% had children under the age of 18 living with them, 43.6% were married couples living together, 6.2% had a female householder with no husband present, 3.3% had a male householder with no wife present, and 46.9% were non-families. 45.4% of all households were made up of individuals, and 31.4% had someone living alone who was 65 years of age or older. The average household size was 1.80 and the average family size was 2.45.
The median age in the city was 63.5 years. 13.2% of residents were under the age of 18; 2.3% were between the ages of 18 and 24; 9.6% were from 25 to 44; 27.3% were from 45 to 64; and 47.6% were 65 years of age or older. The gender makeup of the city was 43.5% male and 56.5% female.
As of the census of 2000, there were 1,101 people, 528 households, and 296 families living in the city. The population density was 1178.5sp=usNaNsp=us. There were 625 housing units at an average density of 669sp=usNaNsp=us. The racial makeup of the city was 99.00% White, 0.36% Native American, 0.27% Asian, and 0.36% from two or more races.
There were 528 households, out of which 15.5% had children under the age of 18 living with them, 50.6% were married couples living together, 3.4% had a female householder with no husband present, and 43.9% were non-families. 41.7% of all households were made up of individuals, and 29.2% had someone living alone who was 65 years of age or older. The average household size was 1.96 and the average family size was 2.64.
In the city, the population was spread out, with 15.5% under the age of 18, 4.4% from 18 to 24, 14.7% from 25 to 44, 20.0% from 45 to 64, and 45.4% who were 65 years of age or older. The median age was 61 years. For every 100 females, there were 81.4 males. For every 100 females age 18 and over, there were 80.9 males.
The median income for a household in the city was $19,826, and the median income for a family was $30,956. Males had a median income of $23,194 versus $17,000 for females. The per capita income for the city was $13,379. About 11.4% of families and 15.9% of the population were below the poverty line, including 6.5% of those under age 18 and 22.7% of those age 65 or over.
Eureka Municipal Airport is a city-owned, public-use airport located two nautical miles (4 km) north of the central business district of Eureka.[6] It is also served by two state highways: