[5] According to the United States Census Bureau, the city has a total area of 1.02 square miles (2.64 km2), all land.

[7] The 2020 United States census counted 1,329 people, 595 households, and 340 families in Ness City.

There were 710 housing units at an average density of 488.0 per square mile (188.4/km2).

37.3% of households consisted of individuals and 19.7% had someone living alone who was 65 years of age or older.

[19][20] As of the census[21] of 2010, there were 1,449 people, 635 households, and 392 families residing in the city.

There were 739 housing units at an average density of 724.5 per square mile (279.7/km2).

35.9% of all households were made up of individuals, and 17.1% had someone living alone who was 65 years of age or older.

There were 800 housing units at an average density of 780.0 per square mile (301.2/km2).

36.0% of all households were made up of individuals, and 20.3% had someone living alone who was 65 years of age or older.

The community is served by Ness City USD 303 public school district.