The maps show the different townships--no families.
It is helpful if you know the area that the families are in so you will know where to look on the census records.
For instance, most of my family is from Dunn Township where Pilot is located. I know to expand my search to the townships that are around Dunn's township if I don't locate them all in Dunn's.
So if you know the township that Epsom is located in, look on the census and you will find your families.