Blackwater Township is one of fourteen townships in Cooper County, Missouri, USA.

As of the 2000 census, its population was 406.

[1] The township takes its name from Blackwater River.

[2] According to the United States Census Bureau, Blackwater Township covers an area of 25.26 square miles (65.42 square kilometers); of this, 24.88 square miles (64.45 square kilometers, 98.52 percent) is land and 0.37 square miles (0.97 square kilometers, 1.48 percent) is water.

(This list is based on USGS data and may include former settlements.)