Grainfield is a city in northern Gove County, Kansas, United States.

[7] The Grainfield Opera House is listed on the National Register of Historic Places.

According to the United States Census Bureau, the city has a total area of 0.48 square miles (1.24 km2), all land.

[8] The 2020 United States census counted 322 people, 132 households, and 79 families in Grainfield.

There were 158 housing units at an average density of 342.0 per square mile (132.0/km2).

36.4% of households consisted of individuals and 19.7% had someone living alone who was 65 years of age or older.

There were 162 housing units at an average density of 337.5 per square mile (130.3/km2).

33.1% of all households were made up of individuals, and 15.8% had someone living alone who was 65 years of age or older.

34.0% of all households were made up of individuals, and 21.3% had someone living alone who was 65 years of age or older.

Grainfield is served by Wheatland USD 292 public school district.

The Wheatland/Grinnell Thunderhakws won the following Kansas State High school championships: The Wheatland Shockers won the following Kansas high school championships: