According to data from the US BLS, the unemployment rate of Connecticut was 6.9% (sa) in February, 2021. Among all Connecticut counties, these 3 were among those with high unemployment rates (nsa): New London (8.7%), New Haven (8%), and Hartford (7.9%).

On the hand, the following three counties were among those with low unemployment rates (nsa): Tolland (6.5%), Middlesex (6.6%), and Litchfield (7.4%).

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

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