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

On the hand, the following three counties were among those with low unemployment rates (nsa): Middlesex (4.5%), Tolland (4.6%), and Litchfield (4.9%).

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

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