In the year, 1811 there was a large seismic activity located on the New Madrid Fault Line.

Discovery Park is a 50-acre encyclopedic museum and heritage park with exhibits pertaining to local and national history, military history, art, science, and technology.

[1] As of the 2020 United States census, there were 30,787 people, 12,717 households, and 8,389 families residing in the county.

25.70% of all households were made up of individuals, and 12.10% had someone living alone who was 65 years of age or older.

The county is part of District 24 of the Tennessee Senate, currently represented by Republican John Stevens.

[20] At the federal level, it is part of the state's 8th congressional district, currently represented by Republican David Kustoff.

Obion County has a public library, with a 30,000-square-foot (2,800 m2) building and a catalog of over 70,000 books, video and audio materials.

[24] Residents of the county's unincorporated communities have the option of paying $75 per year if they want firefighting services from the city of South Fulton.