As of the 2020 United States Census, Chattahoochee Hills had a population of approximately 3,360 residents. Because of its large geographic size, the city has an exceptionally low population density of around 65 people per square mile—a stark contrast to the rest of Fulton County.
The population is roughly 65-70% White and 20-25% Black or African American, with smaller percentages of Hispanic, Asian, and multiracial residents. The city has experienced steady growth, driven largely by the ongoing development of the Serenbe community and the arrival of affluent professionals and retirees seeking a rural lifestyle. The demographic makeup reflects a blend of multi-generational farming families and newer residents drawn to the area's conservation-focused, upscale developments. Educational attainment and median household incomes are generally higher than the state average.