According to data from the US BLS, the unemployment rate of Connecticut was 4.9% (sa) in May, 2016. Among all Connecticut counties, these 3 were among those with high unemployment rates (nsa): Windham (5.3%), New Haven (5.2%), and Hartford (5%).

On the hand, the following three counties were among those with low unemployment rates (nsa): Middlesex (4.2%), Litchfield (4.2%), and Tolland (4.3%).

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

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