Hi Lynn
If you Googlemap them you will see where they are. Scone is north west of Newcastle in the Hunter and is about 450k from Yass, Boorowa (as it now is) and Binalong, so they travelled a long way.
Yass is on the Hume Highway, and is about 60k north of Canberra. Boorowa is about 60k northwest of Yass, with Binalong about halfway between Yass and Boorowa.
Do you ahve the death certs for James and Mary? You may find that it is only the registration that took place in Yass. It's tempting to see the place the place of registration as the place the event happened. I note on the NSW BMDs that Mary's place of death is listed as Binalong, as are what would seem to be two of their sons - Henry d 1867 and William d 1871.
Cheers, Judith