[5] The government of the county was organized in 1836, during the early years of settlement and before the forced removal of the Potawatomi people in 1838.

They were mainly members of the Congregational Church, although due to the Second Great Awakening many of them had converted to Methodism and some had become Baptists before migrating to the new area.

[6] The low, rolling hills of Marshall County are completely devoted to agriculture where possible (significant drainages are wooded).

[7] The highest points on the terrain are three approximately equal swells (900 ft; 270 m ASL) along the south border line with Fulton County, 1.4 miles (2.3 km) NW of Richland Center.

[7] The Yellow River flows through northern, central, and western portions of Marshall County, past Plymouth; the Tippecanoe River flows southwesterly through the SE part of the county.

The commissioners execute acts legislated by the council, collect revenue, and manage the functions of the county government.

[12][13] Current commissioners: Stan Klotz, Mike Burroughs, Kevin Overmyer (as of July 2020) Court: The county maintains a small claims court that handles civil cases.

The judge on the court is elected to a term of four years and must be a member of the Indiana Bar Association.

[13] Marshall County is part of Indiana's 2nd congressional district and is currently represented by Rudy Yakym in the United States Congress.