According to data from the US BLS, the unemployment rate of Connecticut was 3.6% (sa) in September, 2019. Among all Connecticut counties, these 3 were among those with high unemployment rates (nsa): Hartford (3.3%), New Haven (3.3%), and Windham (3.2%).

On the hand, the following three counties were among those with low unemployment rates (nsa): Tolland (2.6%), Middlesex (2.7%), 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.