WordNet (r) 3.0 (2006):

head count
    n 1: number of people in a particular group [syn: head count,
         headcount]

Moby Thesaurus II by Grady Ward, 1.0:

46 Moby Thesaurus words for "head count":
   account, accounts, agenda, beadroll, body count, cadastre,
   calendar, capitulation, census, census report, checklist,
   checkroll, count, docket, dramatis personae, honor roll, inventory,
   jury list, jury panel, lineup, muster, muster roll, nose count,
   order of business, poll, program, property roll, questionnaire,
   recapitulation, reckoning, recount, recounting, rehearsal,
   repertory, returns, roll, roll call, roster, rota, scroll,
   statement, summary, summation, summing, summing up, tax roll