Norcross is a city located in Gwinnett County, Georgia, United States. According to the 2010 census, the population was 9,116, while in 202…Norcross is a city located in Gwinnett County, Georgia, United States. According to the 2010 census, the population was 9,116, while in 2020, the population increased to 17,209. Norcross is part of the Atlanta-Sandy Springs-Marietta metropolitan statistical area.