Numbers 3:22
Their listing according to the number of all the males from a month old and upward was 7,500.
Numbers 4:38-40
Those listed of the sons of Gershon, by their clans and their fathers' houses,
Treasury of Scripture Knowledge
Summary
Those that were numbered of them, according to the number of all the males, from a month old and upward, even those that were numbered of them were seven thousand and five hundred.
From a month old
General references
Bible References
From a month old
Numbers 4:38
Those listed of the sons of Gershon, by their clans and their fathers' houses,
General references
Numbers 3:15
"List the sons of Levi, by fathers' houses and by clans; every male from a month old and upward you shall list."
Joshua 21:6
The Gershonites received by lot from the clans of the tribe of Issachar, from the tribe of Asher, from the tribe of Naphtali, and from the half-tribe of Manasseh in Bashan, thirteen cities.