Warren County, Ohio, has the highest average income in the Cincinnati area. The U.S. Census Bureau’s American Community Survey found that the average income in the county in 2005 was $75,619, well above the state average of $55,937, according to The Cincinnati Post. In Kentucky, Boone County’s average income was $67,020, nearly $18,000 more than that state’s average.
http://news.cincypost.com/apps/pbcs.dll/article?AID=/20060830/NEWS01/608300344