Westphalia is a city in Anderson County, Kansas, United States. As of the 2010 census, the city population was 163.
Westphalia is located at 38°10′52″N 95°29′27″W / 38.18111°N 95.49083°W / 38.18111; -95.49083 (38.181226, -95.490698). According to the United States Census Bureau, the city has a total area of 0.2 square miles (0.5 km²), all of it land.
As of the census of 2000, there were 165 people, 66 households, and 39 families residing in the city. The population density was 834.8 people per square mile (318.5/km²). There were 75 housing units at an average density of 379.5 per square mile (144.8/km²). The racial makeup of the city was 95.15% White, 1.82% Native American, and 3.03% from two or more races. Hispanic or Latino of any race were 1.82% of the population.