Hosmer is a city in northwestern Edmunds County, South Dakota, United States.

[9] The name for the town of Hosmer came from a railroad agent's wife's maiden name, Stella A.

[10] According to the United States Census Bureau, the city has a total area of 0.99 square miles (2.56 km2), all land.

48.0% of all households were made up of individuals, and 20% had someone living alone who was 65 years of age or older.

None of the families and 8.3% of the population were living below the poverty line, including no under eighteens and 19.0% of those over 64.

Hosmer was home to the Hosmer Tigers until the end of the 1990–1991 school year, when they combined with the Roscoe Hornets of Roscoe, South Dakota, to make Edmunds Central, home of the Raiders.

Due to the state's open enrollment policy, parents may choose to send their children where they wish, although most primary and secondary students living in the Hosmer school district have continued attending Edmunds Central in Roscoe.