Tonganoxie is a city in Leavenworth County, Kansas, United States. As of the 2010 census, the city population was 4,996.
Tonganoxie is located at 39°6′32″N 95°5′13″W / 39.10889°N 95.08694°W / 39.10889; -95.08694 (39.108880, -95.086885). According to the United States Census Bureau, the city has a total area of 3.1 square miles (8.1 km²), all of it land.
As of the census of 2000, there were 2,728 people, 999 households, and 737 families residing in the city. The population density was 869.8 people per square mile (335.4/km²). There were 1,032 housing units at an average density of 329.0 per square mile (126.9/km²). The racial makeup of the city was 95.23% White, 1.17% African American, 0.88% Native American, 0.37% Asian, 0.26% Pacific Islander, 0.66% from other races, and 1.43% from two or more races. Hispanic or Latino of any race were 2.27% of the population.