Förmodligen inte många
Bilaga A berättar för oss att Gråbergen koloniserades av Thorin I, farfar Thorin Oakenshield, efter förlusten av Moria (betoning min):
[T]he glory of Moria passed, and its people were destroyed or fled far away.
Most of these that escaped made their way into the North, and Thráin I, Náin's son, came to Erebor, the Lonely Mountain, near the eastern eaves of Mirkwood, and there he began new works, and became King under the Mountain. In Erebor he found the great jewel, the Arkenstone, Heart of the Mountain. But Thorin I his son removed and went into the far North to the Grey Mountains, where most of Durin's folk were now gathering; for those mountains were rich and little explored.
Return of the King Appendix A "Annals of the Kings and Rulers" III "Durin's Folk"
Men vi är också berättade att dessa bosättningar väsentligen övergavs efter att ha drabbats av drakar:
But there were dragons in the wastes beyond; and after many years they became strong again and multiplied, and they made war on the Dwarves, and plundered their works. At last Dáin I, together with Frór his second son, was slain at the door of his hall by a great cold-drake.
Not long after most of Durin's Folk abandoned the Grey Mountains.
Return of the King Appendix A "Annals of the Kings and Rulers" III "Durin's Folk"
Alla dessa händelser äger rum långt före händelserna i Hobbit ; Bilaga B berättar för oss att Dáins död sker i TA 2589, medan Quest for Erebor förekommer i TA 2941.
Eftersom texten ovan bara säger att Gråbergen övergavs av "most" av Durins folk, menar vi förmodligen att förstå att vissa kvarhållanden var kvar, även 400 år efter det faktum.