Junius is an unincorporated community in Lake County, in the U.S. state of South Dakota.

[2] Junius was originally called Midway, and under the latter name was laid out in 1878.

[3] The present name honors Junius, the son of a railroad official.

[3] A post office called Junius was established in 1904, and remained in operation until 1957.

This South Dakota state location article is a stub.