According to data from the US BLS, the unemployment rate of New Hampshire was 3.2% (sa) in September, 2015. Among all New Hampshire counties, these 3 were among those with high unemployment rates (nsa): Coos (3.2%), Hillsborough (3.1%), and Rockingham (3.1%).

On the hand, the following three counties were among those with low unemployment rates (nsa): Grafton (2.3%), Sullivan (2.4%), and Strafford (2.6%).

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

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