According to data from the US BLS, the unemployment rate of New Hampshire was 2.5% (sa) in October, 2018. Among all New Hampshire counties, these 3 were among those with high unemployment rates (nsa): Coos (2.4%), Rockingham (2.4%), and Carroll (2.2%).

On the hand, the following three counties were among those with low unemployment rates (nsa): Grafton (1.7%), Sullivan (1.8%), and Strafford (1.9%).

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

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