Kirwin is a city in Phillips County, Kansas, United States.

It was named for Col. John Kirwin, who commanded a stockade at the town site.

[9] The 2020 United States census counted 139 people, 65 households, and 43 families in Kirwin.

There were 123 housing units at an average density of 134.4 per square mile (51.9/km2).

24.6% of households consisted of individuals and 9.2% had someone living alone who was 65 years of age or older.

[15] The percent of those with a bachelor’s degree or higher was estimated to be 12.2% of the population.

There were 163 housing units at an average density of 169.8 per square mile (65.6/km2).

43.7% of all households were made up of individuals, and 19.5% had someone living alone who was 65 years of age or older.

There were 151 housing units at an average density of 159.2 per square mile (61.5/km2).

33.3% of all households were made up of individuals, and 14.6% had someone living alone who was 65 years of age or older.

About 6.6% of families and 12.3% of the population were below the poverty line, including 18.5% of those under the age of eighteen and 14.6% of those 65 or over.