Coolville is located at . It is located on the right bank of the Hocking River, a few miles upstream from its confluence with the Ohio River. US 50/SR 32/SR 7, Appalachian Corridor D, bypasses the town on the north side, just outside the built-up area, and provides highway access to the community. OH-144, located on the near bank of the Hocking River, also provides access. According to the United States Census Bureau, the village has a total area of, of which is land and is water.
As of the census of 2010, there were 496 people, 188 households, and 139 families living in the village. The population density was. There were 218 housing units at an average density of. The racial makeup of the village was 98.0% White, 0.4% African American, and 1.6% from two or more races. Hispanic or Latino of any race were 0.2% of the population. There were 188 households, of which 34.6% had children under the age of 18 living with them, 54.3% were married couplesliving together, 13.3% had a female householder with no husband present, 6.4% had a male householder with no wife present, and 26.1% were non-families. 21.3% of all households were made up of individuals, and 11.7% had someone living alone who was 65 years of age or older. The average household size was 2.64 and the average family size was 3.08. The median age in the village was 39 years. 25% of residents were under the age of 18; 6.7% were between the ages of 18 and 24; 27.7% were from 25 to 44; 28% were from 45 to 64; and 12.7% were 65 years of age or older. The gender makeup of the village was 48.0% male and 52.0% female.
2000 census
As of the census of 2000, there were 528 people, 213 households, and 148 families living in the village. The population density was 627.1 people per square mile. There were 232 housing units at an average density of 275.5 per square mile. The racial makeup of the village was 98.86% White, 0.38% from other races, and 0.76% from two or more races. There were 213 households, out of which 29.6% had children under the age of 18 living with them, 53.5% were married couples living together, 11.7% had a female householder with no husband present, and 30.5% were non-families. 24.9% of all households were made up of individuals, and 14.6% had someone living alone who was 65 years of age or older. The average household size was 2.48 and the average family size was 2.94. In the village, the population was spread out, with 25.9% under the age of 18, 6.4% from 18 to 24, 28.2% from 25 to 44, 24.1% from 45 to 64, and 15.3% who were 65 years of age or older. The median age was 36 years. For every 100 females there were 100.8 males. For every 100 females age 18 and over, there were 91.7 males. The median income for a household in the village was $31,731, and the median income for a family was $37,500. Males had a median income of $38,889 versus $23,500 for females. The per capita income for the village was $17,639. About 12.0% of families and 15.6% of the population were below the poverty line, including 25.9% of those under age 18 and 18.3% of those age 65 or over.
In 1818 Coolville was platted by Simeon W. Cooley, for whom it is named. The village was incorporated in 1835. By the 1830s, Coolville contained two stores, a gristmill, and a sawmill. Coolville has been noted for its unusual place name. The village is located close to three other "hot/cold" communities: Torch and Frost, and Snowville in Meigs County. Coolville is alleged to be the birthplace of Mojo Doonican, occasional bass player from the British comedy folk band The Bar-Steward Sons of Val Doonican. Coolville was taken over by a Dutch insurgency in July of 2020. Efforts to rename the town "Awesomeville" were squandered by the Democratic Party of Coolville, led by Bill Clinton and his very cool saxophone solo.
