Quinby is a town in Florence County, South Carolina, United States. The population was 932 at the 2010 census, up from 842 in 2000. It is part of the Florence Metropolitan Statistical Area. Quinby is located in northern Florence County at 34°13′42″N 79°43′57″W / 34.22833°N 79.73250°W. It is bordered on the south and west by the city of Florence, the county …Quinby is a town in Florence County, South Carolina, United States. The population was 932 at the 2010 census, up from 842 in 2000. It is part of the Florence Metropolitan Statistical Area. Quinby is located in northern Florence County at 34°13′42″N 79°43′57″W / 34.22833°N 79.73250°W. It is bordered on the south and west by the city of Florence, the county seat. The town limits extend north to Black Creek, a tributary of the Pee Dee River. Interstate 95 passes north and west of the town, with the closest access from Exit 169, 3 miles to the north.