According to data from the US BLS, the unemployment rate of Connecticut was 5.4% (sa) in September, 2015. Among all Connecticut counties, these 3 were among those with high unemployment rates (nsa): New Haven (5.8%), Windham (5.6%), and Hartford (5.4%).

On the hand, the following three counties were among those with low unemployment rates (nsa): Tolland (4.2%), Middlesex (4.5%), and Litchfield (4.5%).

The chart and table below shows the unemployment rate (nsa) for each county.

You can see similar information by state for the United States.