Cumming is a city in the American state of Georgia. The city is the county seat of Forsyth County. About 5,800 people live in Cumming. According to the United States Census Bureau, the city has a total area of 15.3 km² (5.9 mi²). 15.3 km² (5.9 mi²) of it is land and 0.1 km² (0.04 mi²) of it (0.34%) is water.