According to data from the US BLS, the unemployment rate of Connecticut was 11.7% (sa) in May, 2020. Among all Connecticut counties, these 3 were among those with high unemployment rates (nsa): New London (16.8%), Fairfield (11.6%), and Hartford (11.6%).

On the hand, the following three counties were among those with low unemployment rates (nsa): Tolland (9%), Middlesex (9.7%), and Litchfield (9.8%).

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

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