At times I am lazy and just re-quote information posted by other dr1 contributors as I think you know.
In the case of the population figures for Sos?a I haven't checked since the election but I recall it being closer to 60,000. It is a large municipality, extending all the way east to Sabaneta and west to Cangrejo. The factors you mention contribute significantly. For that reason and also my own experience with their "methodology", I believe the 2010 amounts reported are substantially less than the latest figures.
Sabaneta????So you are saying Cabarete is part of Sosua???