Collyer is a city in Trego County, Kansas, United States.

[6] According to the United States Census Bureau, the city has a total area of 0.25 square miles (0.65 km2), all land.

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

[8] The 2020 United States census counted 97 people, 45 households, and 31 families in Collyer.

There were 60 housing units at an average density of 256.4 per square mile (99.0/km2).

26.7% of households consisted of individuals and 13.3% had someone living alone who was 65 years of age or older.

[10] The 2016-2020 5-year American Community Survey estimates show that the median household income was $43,750 (with a margin of error of +/- $20,687).

There were 77 housing units at an average density of 308.0 per square mile (118.9/km2).

26.5% of all households were made up of individuals, and 12.2% had someone living alone who was 65 years of age or older.

37.3% of all households were made up of individuals, and 22.0% had someone living alone who was 65 years of age or older.

There were 25.8% of families and 19.4% of the population living below the poverty line, including 9.3% of under eighteens and 30.0% of those over 64.