Assaria is a city in Saline County, Kansas, United States.

[6] According to the United States Census Bureau, the city has a total area of 0.19 square miles (0.49 km2), all land.

[8] The 2020 United States census counted 428 people, 169 households, and 117 families in Assaria.

23.1% of households consisted of individuals and 12.4% had someone living alone who was 65 years of age or older.

The racial makeup of the city was 98.3% White, 0.2% Native American, and 1.5% from two or more races.

18.2% of all households were made up of individuals, and 7.6% had someone living alone who was 65 years of age or older.

15.7% of all households were made up of individuals, and 4.6% had someone living alone who was 65 years of age or older.

None of the families and 1.9% of the population were living below the poverty line, including no under eighteens and 2.2% of those over 64.

A Great Plains Manufacturing research and development facility is located in Assaria.

The community is served by Southeast of Saline USD 306 public school district.

The Assaria Trojans[22] won the Kansas State High School class B baseball championship in 1959 and 1960.