The occasions on which, in the course of history, Israel were numbered, are as follows: Jacob counted his household upon entering Egypt; Moses counted Israel upon the exodus from Egypt; after the worship of the Golden Calf; at the arrangement into camp divisions; and at the distribution of the promised land. Saul twice instituted a census of the people, the first time when he set out against Nahash, the Ammonite, and the second time when he set out in war upon Amalek.
It is significant of the enormous turn in the prosperity of the Jews during Saul's reign, that at the first census every man put down a pebble, so that the pebbles might be counted, but at the second census the people were so prosperous that instead of putting down a pebble, every man brought a lamb. There was a census in the reign of David, which, however, not having been ordered by God, had unfortunate consequences both for the king and for the people.
Ezra instituted the last census when the people returned from Babylon to the Holy Land. Apart from these nine censuses, God will Himself count His people in the future time when their number will be so great that no mortal will be able to count them.