Plains is a city in Meade County, Kansas, United States.

It is notable for the width of its main street which is the widest in the United States at 155 feet 5 inches (47.37 m) across.

[5] According to the United States Census Bureau, the city has a total area of 1.00 square mile (2.59 km2), all of it land.

[7] The 2020 United States census counted 1,037 people, 367 households, and 268 families in Plains.

There were 433 housing units at an average density of 433.4 per square mile (167.3/km2).

23.4% of households consisted of individuals and 8.2% had someone living alone who was 65 years of age or older.

There were 439 housing units at an average density of 439.0 per square mile (169.5/km2).

18.2% of all households were made up of individuals, and 6.5% had someone living alone who was 65 years of age or older.

22.1% of all households were made up of individuals, and 10.7% had someone living alone who was 65 years of age or older.

The community is served by Southwestern Heights USD 483 public school district.

Its high school, Southwestern Heights, is located between Kismet and Plains along U.S. Route 54 highway.