According to data from the US BLS, the unemployment rate of Connecticut was 3.7% (sa) in October, 2019. Among all Connecticut counties, these 3 were among those with high unemployment rates (nsa): Hartford (3.4%), New Haven (3.4%), and Fairfield (3.2%).

On the hand, the following three counties were among those with low unemployment rates (nsa): Tolland (2.7%), Middlesex (2.8%), and Litchfield (2.8%).

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

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