Cass County, Minnesota: History
Cass County was created on September 1, 1851, by the Minnesota Territory legislature, although its government was not organized until 1897. The county was formed of areas partitioned from Dakota, Mahkatah, Pembina and Wahnata Counties. It was named for Lewis Cass, a Michigan political figure of the 19th century. Before it was organized several parcels of county land were partitioned off to augment or form adjacent counties.