Spalding County is a county located in the west central portion of the U.S. state of Georgia. As of the 2010 census, the population was 64,073. The county seat is Griffin. The county was created December 20, 1851 and named for former United States representative and senator Thomas Spalding. Spalding County is included in the Atlanta-Sandy Springs-Roswell, GA Metropolitan Statistical Area. The western portion of Spalding County, west of a line from Sunny Side through Griffin to Orchard Hill, is located in the Upper Flint River sub-basin of the ACF River Basin (Apalachicola-Chattahoochee-Flint River Basin). The eastern part of the county is located in the Upper Ocmulgee River sub-basin of the Altamaha River basin. As of the 2010 United States Census, there were 64,073 people, 23,565 households, and 16,869 families residing in the county.