Oneida is a city in Nemaha County, Kansas, United States.

[4] According to the United States Census Bureau, the city has a total area of 0.24 square miles (0.62 km2), all land.

[6] The 2020 United States census counted 61 people, 9 households, and 5 families in Oneida.

33.3% of households consisted of individuals and 22.2% had someone living alone who was 65 years of age or older.

[8] The 2016-2020 5-year American Community Survey estimates show that the median household income was $21,435 (with a margin of error of +/- $762).

23.1% of all households were made up of individuals, and 3.8% had someone living alone who was 65 years of age or older.

28.0% of all households were made up of individuals, and 20.0% had someone living alone who was 65 years of age or older.

There were no families and 6.7% of the population living below the poverty line, including no under eighteens and none of those over 64.

The community is served by Nemaha Central USD 115 public school district.