The province has a population of about 85,000 with Las Terrenas having about 11,000 and Las Galeras less than 1,500 including the surrounding area-this end of the peninsula. I've would guess that Samana has about 15,000 or less and Sanchez around the 10,000 figure. The rest live in the many little villages and communities that dot the peninsula.
I only can guess at the number of foreigners living in each of the 4 major towns: Las Terrenas has about 1,100, Las Galeras about 100 or less, and Samana and Sanchez I have no idea. I would venture to say that the foreign population probably makes up less that 2 % of the total population, or about 1,500. I want to stress that this is only a guess and I could be way off, but I know the 85,000 figure to be fairly accurate.