People are countable. That’s the whole point of a census. Water can come in any amount, such as 3.5 litres. People come in discrete numbers. You can’t have .5 of a person.
I think the thing confusing you is that it’s one of those weird English words where the singular and plural word are different. Person/people vs car/cars.
You can still say “waters” though. For example: “The waters of Amsterdam” would collectively refer to all bodies of water in Amsterdam. Another example I came across online was “Don’t forget your waters” which referred to multiple bottles of water.
People are countable. That’s the whole point of a census. Water can come in any amount, such as 3.5 litres. People come in discrete numbers. You can’t have .5 of a person.
I think the thing confusing you is that it’s one of those weird English words where the singular and plural word are different. Person/people vs car/cars.
You can still say “waters” though. For example: “The waters of Amsterdam” would collectively refer to all bodies of water in Amsterdam. Another example I came across online was “Don’t forget your waters” which referred to multiple bottles of water.