The lower Pioneer Valley corresponds to the Springfield , Massachusetts metropolitan area , the region 's urban center , and the seat of Hampden County .
It is generally taken to comprise the three counties of Hampden , Hampshire , and Franklin .
The lower Pioneer Valley corresponds to the Springfield , Massachusetts metropolitan area , the region 's urban center , and the seat of Hampden   .
It is generally taken to comprise the three counties of Hampden , Hampshire , and Franklin .