According to data from the US BLS, the unemployment rate of Connecticut was 4.7% (sa) in September, 2016. Among all Connecticut counties, these 3 were among those with high unemployment rates (nsa): New Haven (5%), Hartford (4.8%), and Windham (4.7%).

On the hand, the following three counties were among those with low unemployment rates (nsa): Tolland (3.8%), Middlesex (3.9%), and Litchfield (4%).

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

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