Coldwater is a village in Mercer County, Ohio, United States. The population was 4,774 at the 2020 census.

Coldwater was founded in 1838 and was originally called Buzzard's Glory for by David Buzzard who operated a general store. Coldwater was platted in 1859. The village takes its name from nearby Coldwater Creek. A post office has been in operation at Coldwater since 1847.

According to the United States Census Bureau, the village has a total area of 1.97 square miles (5.10 km), of which 1.92 square miles (4.97 km) is land and 0.05 square miles (0.13 km) is water.

Historical population

Census	Pop.	Note	%±
1880	1,001		—
1890	1,276		27.5%
1900	1,515		18.7%
1910	1,114		−26.5%
1920	974		−12.6%
1930	1,516		55.6%
1940	2,449		61.5%
1950	3,702		51.2%
1960	4,151		12.1%
1970	3,952		−4.8%
1980	4,007		1.4%
1990	4,411		10.1%
2000	4,482		1.6%
2010	4,427		−1.2%
2020	4,774		7.8%
2023 (est.)	4,712		−1.3%
U.S. Decennial Census

As of 2000 the median income for a household in the village was $63,382, and the median income for a family was $81,076. Males had a median income of $47,055 versus $42,401 for females. The per capita income for the village was $29,583. About 2.2% of families and 3.4% of the population were below the poverty line, including 1.2% of those under age 18 and 4.2% of those age 65 or over.

As of the census of 2010, there were 4,427 people, 1,726 households, and 1,176 families residing in the village. The population density was 2,305.7 inhabitants per square mile (890.2/km). There were 1,817 housing units at an average density of 946.4 per square mile (365.4/km). The racial makeup of the village was 99.0% White, 0.1% African American, 0.1% Asian, 0.3% Pacific Islander, 0.2% from other races, and 0.3% from two or more races. Hispanic or Latino of any race were 0.7% of the population.

There were 1,726 households, of which 32.7% had children under the age of 18 living with them, 58.1% were married couples living together, 6.5% had a female householder with no husband present, 3.5% had a male householder with no wife present, and 31.9% were non-families. 29.1% of all households were made up of individuals, and 15.2% had someone living alone who was 65 years of age or older. The average household size was 2.49 and the average family size was 3.10.

The median age in the village was 39.2 years. 26.2% of residents were under the age of 18; 7.9% were between the ages of 18 and 24; 22.9% were from 25 to 44; 25.9% were from 45 to 64; and 17.1% were 65 years of age or older. The gender makeup of the village was 47.9% male and 52.1% female.

It is home to Coldwater High School, Coldwater Middle School, and Coldwater Elementary School, public schools that are part of the Coldwater Exempted Village School District.

It is home to the Coldwater Public Library, which is largely funded by the proceeds from the annual Coldwater Community Picnic.

• Douglas Laux, New York Times bestselling author; CIA case officer
• Keith Wenning, quarterback for the Buffalo Bills
• Keven Stammen, professional poker player, winner of 2014 World Poker Tour
• Ross Homan, former linebacker for the Ohio State Buckeyes
• Jesse E. Moorland, abolitionist and theology professor at Howard University
• Cory Luebke, former pitcher for the San Diego Padres
• James Grover McDonald, first U.S. ambassador to Israel, humanitarian

• 
  The northeastern section.
• 
  The southwestern section.
• 
  The southeastern section.

• Official website
• Library