Norcross is a city in Gwinnett County, Georgia,  United States. As of 2010, the population recorded by the U.S. Census Bureau was 9,116. It is included in the Atlanta-Sandy Springs-Marietta, Georgia metropolitan statistical area, which is included in the Atlanta-Sandy Springs-Gainesville, Georgia-Alabama (part) combined statistical area. Although much of western Gwinnett County has a Norcross mailing address, the boundaries of the city do not extend to unincorporated areas.