Tonka Bay is a city located in Hennepin County, Minnesota. As of the 2000 census, the city had a total population of 1,547.
According to the United States Census Bureau, the city has a total area of 2.5 km2 (1.0 mi2). 2.5 km2 (0.9 mi2) of it is land and 0.1 km2 (0.04 mi2) of it is water. The total area is 2.04% water.