Mound Valley is a city in Labette County, Kansas, United States.

[7] According to the United States Census Bureau, the city has a total area of 0.65 square miles (1.68 km2), all land.

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

[9] The 2020 United States census counted 348 people, 152 households, and 95 families in Mound Valley.

There were 167 housing units at an average density of 260.1 per square mile (100.4/km2).

35.5% of households consisted of individuals and 13.8% had someone living alone who was 65 years of age or older.

There were 202 housing units at an average density of 310.8 per square mile (120.0/km2).

32.4% of all households were made up of individuals, and 14.1% had someone living alone who was 65 years of age or older.

There were 190 housing units at an average density of 289.3 per square mile (111.7/km2).

30.4% of all households were made up of individuals, and 16.7% had someone living alone who was 65 years of age or older.

The community is served by Labette County USD 506 public school district.