According to data from the US BLS, the unemployment rate of Connecticut was 9.6% (sa) in August, 2020. Among all Connecticut counties, these 3 were among those with high unemployment rates (nsa): New London (10.9%), Hartford (9.9%), and New Haven (9.5%).

On the hand, the following three counties were among those with low unemployment rates (nsa): Tolland (7%), Middlesex (7.4%), and Litchfield (7.6%).

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

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