Gwinnett County Maps
The link below will redirect you to the Gwinnett County GIS - Geographic Information Services. With a subsequent link to the GIS Data Browser. There you will find maps of Gwinnett County, Congressional Districts, GA Senate and House Districts, County Commission districts, Voting Districts, etc.
Note: On the left side of the web-site (hover over the gray arrow in the black box) is the Map Content and Legend where you can select the type of map you are looking for.