High Quality Content by WIKIPEDIA articles! High Quality Content by WIKIPEDIA articles! Forsyth County is a county located in the U.S. state of Georgia. The county seat is Cumming, Georgia. Forsyth County is a part of theAtlanta metropolitan area (Atlanta-Sandy Springs-Marietta, Georgia Metropolitan Statistical Area). As of 2000, the population was 98,407. The 2009 Census Estimate shows a population of 174,520. Forsyth County has been one of the fastest growing areas in the United States in terms of percentage of growth for several years during the 2000s. The population growth was caused by the county's proximity to Atlanta and its appeal as a commuter area for people working in the Atlanta area.