census

/S EH1 N S AH0 S/
noun
  1. 1

    An official count or enumeration of members of a population (not necessarily human), usually residents or citizens in a particular region, often done at regular intervals.

  2. 2

    Count, tally.

verb
  1. 1

    To conduct a census on.

  2. 2

    To collect a census.

Source: https://en.wiktionary.org/wiki/census