The Tennessee counties with the highest average household income in 2011 were in Middle Tennessee and the biggest counties in the state.
1 Williamson County (south of Nashville), $86,922
2 Rutherford County (Murfreesboro), $68,117
3 Davidson County (Nashville), $64,276
4 Shelby County (Memphis), $63,975
5 Knox County (Knoxville), $63,747
Hamilton County (Chattanooga) ranked sixth among the state's 95 counties with an average household income of $61,443.
Source: American Community Survey, 2011, U.S. Bureau of Census