Quincy is a village in Logan County, Ohio, United States. The population was 706 at the 2010 census.
Quincy was laid out in 1830, and named for John Quincy Adams, sixth President of the United States.
Quincy is located at 40°17′51″N 83°58′12″W (40.297577, -83.970111).
According to the United States Census Bureau, the village has a total area of 1.13 square miles (2.93 km2), all of it land.
Except for a small section in the village's northeast corner, Quincy's boundaries form a square.
As of the census of 2010, there were 706 people, 240 households, and 191 families living in the village. The population density was 624.8 inhabitants per square mile (241.2/km2). There were 280 housing units at an average density of 247.8 per square mile (95.7/km2). The racial makeup of the village was 96.5% White, 0.3% African American, 0.4% Native American, 0.1% Asian, 0.3% from other races, and 2.4% from two or more races. Hispanic or Latino of any race were 0.6% of the population.
There were 240 households, of which 43.8% had children under the age of 18 living with them, 55.4% were married couples living together, 15.4% had a female householder with no husband present, 8.8% had a male householder with no wife present, and 20.4% were non-families. 16.3% of all households were made up of individuals, and 3.7% had someone living alone who was 65 years of age or older.