According to data from the US BLS, the unemployment rate of Connecticut was 3.8% (sa) in December, 2019. Among all Connecticut counties, these 3 were among those with high unemployment rates (nsa): Windham (3.1%), Hartford (3%), and New Haven (3%).

On the hand, the following three counties were among those with low unemployment rates (nsa): Tolland (2.5%), Middlesex (2.5%), and Litchfield (2.7%).

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

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