Eureka is a city and county seat of Greenwood County, Kansas, United States. As of the 2010 census, the city population was 2,633, the 2018 census estimate declined to 2,373.
The first settlement at Eureka was in 1857. The first post office in Eureka was established in August 1858. Eureka was laid out in 1867, and it was incorporated in 1870. The city is named from the Greek expression Eureka, meaning "I have found it".
An EF2 tornado struck Eureka on July 7, 2016 at 9:45 pm. Over 143 total structures, including at least 50 homes, businesses, a nursing home, and grain elevator were damaged. No people were injured.
An EF3 tornado struck Eureka on June 26, 2018 at 7:21 pm (daylight). A total of 175 structures were damaged or destroyed. 78 homes were damaged (12 not livable, 10 totaled), and 8 people were injured.
Eureka is located at 37°49′22″N 96°17′22″W (37.822745, −96.289583). According to the United States Census Bureau, the city has a total area of 2.28 square miles (5.91 km2), all of it land.
The climate in this area is characterized by hot, humid summers and generally mild to cool winters.