Allen is a city in Lyon County, Kansas, United States.

[7] According to the United States Census Bureau, the city has a total area of 0.27 square miles (0.70 km2), all of it land.

[8] The climate in this area is characterized by hot, humid summers and generally mild to cool winters.

The 2020 United States census counted 160 people, 77 households, and 44 families in Allen.

35.1% of households consisted of individuals and 23.4% had someone living alone who was 65 years of age or older.

36.4% of all households were made up of individuals, and 13% had someone living alone who was 65 years of age or older.

24.1% of all households were made up of individuals, and 14.5% had someone living alone who was 65 years of age or older.

About 10.2% of families and 8.0% of the population were below the poverty line, including 18.9% of those under the age of eighteen and none of those 65 or over.

The community is served by North Lyon County USD 251 public school district, and its headquarters are located in Americus.

The Northern Heights High School is located east of Allen, and its mascot is the Wildcats.

The closest Kansas Turnpike exit is located approximately 7.5 miles (12.1 km) east of Admire along U.S. Route 56.