Blackwater City Hall is located at 125 Main Street, Blackwater, MO 65322.
Blackwater, population 198, is located in a rural area a few miles north of Interstate 70 in Cooper County. The town was platted when railroad service came to the area in 1887, and the streets in the original part of town are all oriented to the railroad, which runs at a roughly 45 degree angle to the compass points. The railroad, which is still in use, runs along the northeast edge of the community. The town occupies relatively high level ground that slopes gradually to the southeast. The land on the other side of the railroad tracks is lower, with open agricultural fields in the flood plain of the nearby Blackwater River. The commercial center of the community is concentrated on a single block of Main Street, adjacent to the railroad tracks.