headcount
From Longman Business Dictionaryheadcounthead‧count /ˈhedkaʊnt/ (also head count) noun [countable]1informal the number of people employed by an organizationThe new company will operate out of its parent’s offices with an initial headcount of 20 staff.2do a headcount to count how many people are present at a place or eventI did a quick headcount to see how many people had come to the meeting.