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 opeā¦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.