[4] According to the United States Census Bureau, the city has a total area of 0.43 square miles (1.11 km2), all of it land.

[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 108 people, 45 households, and 31 families in Chautauqua.

There were 55 housing units at an average density of 129.7 per square mile (50.1/km2).

24.4% of households consisted of individuals and 13.3% had someone living alone who was 65 years of age or older.

The racial makeup of the city was 87.4% White, 3.6% Native American, 0.9% Asian, and 8.1% from two or more races.

34.6% of all households were made up of individuals, and 15.3% had someone living alone who was 65 years of age or older.

The racial makeup of the city was 89.38% White, 7.08% Native American, and 3.54% from two or more races.

43.4% of all households were made up of individuals, and 22.6% had someone living alone who was 65 years of age or older.

There were 27.3% of families and 38.5% of the population living below the poverty line, including 65.7% of under eighteens and 13.8% of those over 64.