[3] The county was created on December 18, 1833, from land formerly belonging to the Cherokee Indian Nation.

Walker County is part of the Chattanooga TN/GA Metropolitan Statistical Area.

[4] Civil War battles fought in Walker County were part of the Chickamauga Campaign fought between August 21 and September 20, 1863: In 2002 the Tri-State Crematory scandal in Noble came to national attention when 339 bodies that were consigned to be cremated were discovered on the property.

The owner, Ray Brent Marsh, was convicted of several charges and sentenced to twelve years in prison.

The first members of the board were elected in November 2020 and took office in January 2021 with Districts 1 and 2 commissioners serving an initial 2-year term and Districts 3 and 4 commissioners and the chairperson serving an initial 4-year term.

[10] The commissioners of each district represent the following areas:[11] As of the 2020 United States census, there were 67,654 people, 26,760 households, and 17,810 families residing in the county.

As of the 2010 United States census, there were 68,756 people, 26,497 households, and 18,898 families living in the county.

The gender ratio of the county's population was 50.9% female versus 49.1% male.

22.90% of all households were made up of individuals, and 10.40% had someone living alone who was 65 years of age or older.

Walker County School District includes most areas, while areas in the Chickamauga city limits are in the Chickamauga City School District.