[4] During the Civil War, a military post was established at Mound City.

On October 25, 1864, Mound City was attacked twice by Confederates retreating south after their defeat at the Battle of Westport.

The military post was closed and abandoned in June 1865 after the end of the war.

[5] The climate in this area is characterized by hot, humid summers and generally mild to cool winters.

[6] The 2020 United States census counted 647 people, 285 households, and 183 families in Mound City.

31.9% of households consisted of individuals and 14.7% had someone living alone who was 65 years of age or older.

[19][20] As of the census[21] of 2010, there were 694 people, 297 households, and 177 families residing in the city.

36.7% of all households were made up of individuals, and 18.5% had someone living alone who was 65 years of age or older.

As of the census[22] of 2000, there were 821 people, 331 households, and 219 families residing in the city.

31.4% of all households were made up of individuals, and 18.4% had someone living alone who was 65 years of age or older.

The community is served by Jayhawk USD 346 public school district.