Herndon is a city in Rawlins County, Kansas, United States.

[3] It is located approximately 12.5 miles (20.1 km) south of the Kansas-Nebraska state border.

[5] According to the United States Census Bureau, the city has a total area of 0.26 square miles (0.67 km2), all land.

[6] The 2020 United States census counted 119 people, 55 households, and 30 families in Herndon.

There were 93 housing units at an average density of 295.2 per square mile (114.0/km2).

45.5% of households consisted of individuals and 25.5% had someone living alone who was 65 years of age or older.

The racial makeup of the city was 94.6% White, 2.3% African American, and 3.1% from two or more races.

42.4% of all households were made up of individuals, and 13.6% had someone living alone who was 65 years of age or older.

54.2% of all households were made up of individuals, and 33.7% had someone living alone who was 65 years of age or older.

There were 7.7% of families and 12.3% of the population living below the poverty line, including 17.8% of under eighteens and 9.8% of those over 64.