An estimated 398,000 undocumented immigrants currently live in Georgia, according to a report released Thursday by The Migration Policy Institute in Washington, D.C., and most of them lack health insurance. Cobb, DeKalb, Fulton and Gwinnett counties were named in the report as having the highest population of undocumented immigrants in the state. The report found that 76 percent of all undocumented individuals in Georgia are uninsured.