Widowmaker

From the introduction:

There are dozens, even hundreds, of permanent settlements in the Belt, in the form of either free-floating stations or habitats built onto the surface of the larger, more stable asteroids. The battered station Goliath’s Belt is still the single largest human habitation in the region, averaging over 3,000 souls on board at any given time, but several other settlements have populations that reach into the low four figures.