Fulton County was created by the Georgia General Assembly in 1853. Of Georgia's 159 counties, Fulton County was the 144th to be created.

The land that was part of the original Fulton County was previously part of DeKalb County. Then, due to financial troubles during the Great Depression, Milton and Campbell counties were added to Fulton County in 1932.  Fulton County also annexed the City of Roswell from Cobb County. Fulton County encompasses 528.7 square miles, and stretches over 70 miles from north to South.