No, people live all over the place. My wife and I lived in Stone Farms Apts during first year (good for starting out and for pets, but $$$) and during 1st year found a place a little farther out that was bigger/cheaper. I think Sachem is a good area for the price, but you can find other places if you want to. I do agree with
@GliaLimitans, housing gets very expensive with heating costs (wrestling that beast currently), so an apartment/plowing+heating included set-up is a good idea for the first year.
The job market is small around here, and there has been some trouble for spouses to find jobs with a couple of my classmates. Fortunately, you'll have enough time to look around, but I'd start early and look in the surrounding area besides Dartmouth proper/Hanover/etc.