The questionnaire asks how many people were living at the house or apartment as of April 1. That would mean people already born. If you were pregnant, due around April 1, and mailed your form on March 25 and counted the unborn, I doubt that anybody would quibble over it. Someone down the street may have counted himself, mailed the form and died before April 1. That's not going to throw the count off enough to hurt anything. The overall number will be close enough.
The US does a census every 7-10 years.
92 million people were counted in the 1910 US census.
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It is called census.
The census
U.S. Census
The US officially counts its population every 10 years through the decennial census conducted by the Census Bureau.
every 10 years
every 10 years
A census is an official count of members of a population of people (or of other living things). The government form of a census counts the residents or citizens in specified areas, often at regular intervals.The US Census is an official count of the population done at 10-year intervals, with estimations or corrections made in the intervening years. The latest US Census is for the year 2010.The purpose of the census is to gather information about the country and the people in it.
Enumeration is one possible answer. The census is another.
count numba of people in the us of states