As you Asking for the Contact Details of the branch Gwinnett County of the Citi bank the Details of the branch is given below

Citibank
3000 Northwoods Pkwy, Norcross
30071 GA, USA
Call Us
(770) 849-0024


For knowing the Details of the Any other branches of the Citi bank you may go to the official Site of Citi bank

the page may look as Follow

Citi bank



There At the top of the page you may get the menu of Contact us click on It After clicking you may Redirect to the page from there you may get the Details of the branches of the Citi bank

For your convince Here I am giving you the Snapshot of that page

Citi bank branch locator