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Los Angeles county is about 10 million people
and the metro area includes a few other counties
Moscow and its oblast are about 22M people. Metro areas weren't included, just the city limits of each one. The city of Moscow has a geographical footprint of 2562km2. Chicago is 607km2, LA is 1210 km2, and NYC is 783 km2, which all add up to be almost exactly Moscow's, and what's interesting is the population density of Moscow is about equal to other 3 US cities added and averaged.
for @bitcoin_citizen as well
Yeah, how you carve up the geography matters a lot. I always wondered if there was some underlying order to it. Certainly what you decide counts as NYC is not intuitive, as the whole Eastern seaboard feels like one giant city.
They use statistical clustering based on commute patterns. Once there's enough overlap, two metro areas get merged into one. That's the case for Baltimore and DC, for instance.
This depends on what you're interested in. The difference in size between administrative area population and metropolitan area population tends to be very large in the US. Each of those US metro areas has more than double the administrative area population.