South coast technically doesn't even reach Taunton. South shore is strictly for towns within Massachusetts bay. Hockomock gets close but is a bit east of I-95. Blackstone is also close but that's a bit west. I'd say that those towns are more closely integrated with Hockomock if anything due to the I-95/495 connection. Taunton is squarely Hockomock and it even shares a transit system with Attleboro.