The county is named for Charles Carroll who signed the Declaration of Independence.

[4] The Mississippi Palisades State Park is in this county, just north of the city of Savanna.

[5] As of the 2010 United States census, there were 15,387 people, 6,622 households, and 4,343 families residing in the county.

Of all the counties won by inaugural Republican Party presidential nominee John Charles Frémont in 1856, Carroll County was to maintain the longest unbroken string of supporting the GOP in subsequent elections.

It would give a plurality to every subsequent Republican Presidential nominee up to George W. Bush in 2004, beating by three elections the second longest run of Indiana's Porter County which was to give a plurality to Bill Clinton in 1996.

Obama was to repeat his win in 2012 by 1.49 percent, but a dramatic swing to Republican Donald Trump in 2016 saw him win by the largest margin since Ronald Reagan’s 1984 landslide by gaining 59.6% of the vote in Carroll County, scoring slightly higher than George H.W.