Summerfield is a city in Marshall County, Kansas, United States. As of the 2010 census, the city population was 156.
Summerfield is located at 39°59′47″N 96°20′57″W / 39.99639°N 96.34917°W / 39.99639; -96.34917 (39.996439, -96.349249). According to the United States Census Bureau, the city has a total area of 0.3 square miles (0.9 km²), all of it land.
As of the census of 2000, there were 211 people, 75 households, and 53 families residing in the city. The population density was 629.8 people per square mile (239.6/km²). There were 92 housing units at an average density of 274.6 per square mile (104.5/km²). The racial makeup of the city was 99.05% White, 0.47% Native American, and 0.47% from two or more races.