Mahaska is a city in Washington County, Kansas, United States.

[6] In 1854, the Sixth Principal Meridian or 40th Parallel, approximately 1 mile northwest of the present day Mahaska.

Originally marked in 1856, this site was the beginning point for land surveys for all land in Kansas, Nebraska, three-fourths of Colorado, most of Wyoming, and part of South Dakota.

[4] 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 community is approximately 1.0 mile (1.6 km) south of the Kansas-Nebraska state line.

The 2020 United States census counted 46 people, 22 households, and 14 families in Mahaska.

27.3% of households consisted of individuals and 13.6% had someone living alone who was 65 years of age or older.

[9] The 2016-2020 5-year American Community Survey estimates show that the median household income was $29,261 (with a margin of error of +/- $15,013).

There were 47 housing units at an average density of 188.0 per square mile (72.6/km2).

17.9% of all households were made up of individuals, and 7.7% had someone living alone who was 65 years of age or older.

There were 19.2% of families and 21.6% of the population living below the poverty line, including 30.4% of under eighteens and none of those over 64.