[2] The county was established on January 5, 1833, and was named for General Joseph Warren, who died in the Battle of Bunker Hill during the American Revolutionary War.

[3] Warren County is part of the St. Louis, MO-IL Metropolitan Statistical Area.

Warren County is divided into two legislative districts in the Missouri House of Representatives, both of which are held by Republicans.

The 10th Senatorial District consists of all of Audrain, Callaway, Lincoln, Monroe, Montgomery, and Warren counties.

[14] Like most rural and exurban areas throughout Northeast Missouri, voters in Warren County generally adhere to socially and culturally conservative principles which tend to influence their Republican leanings.

The proposition strongly passed every single county in Missouri with 78.99 percent voting in favor.

(During the same election, voters in five other states also strongly approved increases in the minimum wage.)

Senator Hillary Rodham Clinton (D-New York) received more votes, a total of 1,971, than any candidate from either party in Warren County during the 2008 presidential primary.