Long Island is a city in Phillips County, Kansas, United States.

[5] According to the United States Census Bureau, the city has a total area of 0.44 square miles (1.14 km2), all land.

[6] The 2020 United States census counted 137 people, 52 households, and 34 families in Long Island.

There were 67 housing units at an average density of 163.0 per square mile (62.9/km2).

28.8% of households consisted of individuals and 9.6% had someone living alone who was 65 years of age or older.

There were 77 housing units at an average density of 175.0 per square mile (67.6/km2).

35.0% of all households were made up of individuals, and 15% had someone living alone who was 65 years of age or older.

There were 73 housing units at an average density of 166.1 per square mile (64.1/km2).

31.3% of all households were made up of individuals, and 14.9% had someone living alone who was 65 years of age or older.

Long Island is served by Northern Valley USD 212 public school district.

The Northern Valley High School mascot is Huskies.