Obama is the 44th president, but Grover Cleveland was president twice. This makes a total of 43 people.
There are 100 Senators in the US Senate. No one else has a vote (except on occasion the President of the Senate), so they are not counted when considering how many people there are.
Now 45.
The US at one time may only have one president. The total number of presidents that the US has had if you count the current one is 44.
The total U.S. population counted in the 1790 Census was 3,582,008.
James Madison was President from 1809 - 1817. The US takes a census every ten years, so the Third US Census was taken in 1810.That census showed a total US population of 7,239,881 of which 1,191,362 were slaves.
When Wm. H. Taft became President, US population was: 90,494,000.
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Barack Obama was sworn in as the 44th US President.
A US president may serve up to two terms of four years each, for a total maximum of 8 years in office.
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I have heard about 1% of the total population.