According to data from the US BLS, the unemployment rate of Connecticut was 4.9% (sa) in June, 2016. Among all Connecticut counties, these 3 were among those with high unemployment rates (nsa): Windham (5.5%), New Haven (5.4%), and Hartford (5.3%).

On the hand, the following three counties were among those with low unemployment rates (nsa): Middlesex (4.5%), Litchfield (4.5%), and Tolland (4.8%).

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

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