Carroll County is named after Charles Carroll, the last surviving signer of the Declaration of Independence who passed away four years after the creation of the county. Carroll County is home to a portion of the Michigan Road, an early state road connecting Madison, Shelbyville, Indianapolis, Logansport, South Bend, and Michigan City and connecting the Great Lakes to the Ohio River providing early transportation options and promoting early trade. When deciding the county seat, it was suggested that Carrollton, a community on the Michigan Road, be the county seat, however, General Samuel Milroy who surveyed the land for Delphi and carried the petition for the formation of Carroll County to Indianapolis and the legislature, suggested Delphi be the county seat as a more centrally located place. Just a few days before the vote to form Carroll County and the establishment of Delphi as the county seat, the state had authorized a commission to study the establishment of the Wabash and Erie Canal, initially from Terre Haute to Junction Ohio following the Wabash River. Perhaps General Milroy believed this new canal would better serve Carroll County than the Michigan Road.