That's people that live in Manhattan. That is not the day time (or night time) population of a large business and finance hub, commuter and tourist city.

I can't reply to your comment below, but that wasn't the point I was making. The stats are probably bad for both, and I don't think I trust anything that neighborhood scout is putting out for anywhere, was my point.

But to your suggestion, it _is_ measured by folks. It's called the Commuter Adjusted Day Time Population.

https://www.6sqft.com/see-nycs-population-pulse-over-24-hour...

https://wagner.nyu.edu/files/rudincenter/dynamic_pop_manhatt...

https://www.census.gov/content/dam/Census/library/working-pa...

https://www.census.gov/content/dam/Census/library/working-pa...