63 These are the ones counted by Moses and Eleazar the priest when they counted the Israelites on the plains of Moab by the Jordan across from Jericho.

Read Numbers 26:63 Using Other Translations

These are they that were numbered by Moses and Eleazar the priest, who numbered the children of Israel in the plains of Moab by Jordan near Jericho.
These were those listed by Moses and Eleazar the priest, who listed the people of Israel in the plains of Moab by the Jordan at Jericho.
So these are the results of the registration of the people of Israel as conducted by Moses and Eleazar the priest on the plains of Moab beside the Jordan River, across from Jericho.