Argos is a town in Green and Walnut townships, Marshall County, Indiana, United States.

In 1833, Sidney Williams arrived in the area which is now Marshall County and purchased 600 acres (2.4 km2) of land on the present day site of Argos.

Mr. Williams built a tavern, an inn, and helped build a section of Michigan Road.

This local place of rest wasn’t considered a town until some time later.

On January 8, 1851, John Pleak and Marquis L. Smith, laid out the town of Sidney, which is the predecessor to Argos.

Schuyler Colfax, the congressman in the district, was asked to name the post office.

He had a great interest in Greek history, which led him to name the post office "Argos" after the ancient Greek city made famous in the Iliad of Homer.

On May 21, 1859, a meeting was held in the school house for anyone interested in the formation of a new township.

The purpose of the meeting was to consolidate Sidney and Fremont, select a name for the township, and appoint a suitable person to be the trustee.

25.2% of all households were made up of individuals, and 10.4% had someone living alone who was 65 years of age or older.

25.4% of all households were made up of individuals, and 9.9% had someone living alone who was 65 years of age or older.