DrAnt,
Good to see a post from you. I'm going to leave the definitive answer on this to one of our Virginians, but there is no parish or mission in Clarksville. I just searched it and found the same listings that you cited, but am clueless as to what is being referenced.
Address is 1343 W Orgainsville Rd, Clarksville, VA 23927, which looks to be out in Mecklenburg County - way too distant from any of the VA churches to be a priest's residence (closer to NC, in fact). I don't see any listing in the Catholic Directory to suggest Passaic has any non-church site there. That doesn't mean the Eparchy doesn't own a piece of land there, however.
I'll be curious to see the results of this query.
Many years,
Neil