headcount

/ˈhɛdˌkaʊnt/
noun
  1. The number of people present or involved in a group.
    • We need an accurate headcount for the dinner reservations.
    • The company's headcount grew to over 500 employees this year.
    • The teacher did a headcount before the field trip bus left.
  2. An act of counting the number of people in a group.
    • The camp counselor performed a headcount every evening.
    • After the headcount, they realized two hikers were missing.
    • A quick headcount showed that everyone had arrived safely.