Coldwater is a city in the U.S. state of Michigan. As of the 2010 census, the city population was 10,945. It is the county seat of Branch County.
The city is located at the center of Coldwater Township, though it is politically independent. Coldwater is at 41°56′25″N 85°00′02″W / 41.94028°N 85.00056°W / 41.94028; -85.00056. The ZIP code is 49036 and the FIPS place code is 17020. The elevation is 969 feet (295 m) above sea level.
The Coldwater River flows into the city from the south, originating from Coldwater Lake. The Coldwater chain of lakes also has an outlet called the Sauk River, which flows from its north end (near Quincy) and then through the south side of the city of Coldwater. Both combine to form a series of shallow, connected lakes on the city's west side.