what county is norcross ga in?
Homefacts City Report. Norcross is located in Gwinnett County, GA. The population is 12,869, making Norcross the 7th largest city in Gwinnett County. There are 16 public schools in Norcross with an average Homefacts rating of B-. The total crime rate for Norcross is high, and there are 63 registered sex offenders residing in the city.