According to data from the US BLS, the unemployment rate of Connecticut was 5.9% (sa) in February, 2015. Among all Connecticut counties, these 3 were among those with high unemployment rates (nsa): Windham (7.3%), New Haven (6.7%), and New London (6.7%).

On the hand, the following three counties were among those with low unemployment rates (nsa): Middlesex (5.5%), Tolland (5.6%), and Fairfield (5.9%).

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

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