Juneau, Alaska has a population of roughly 30,000. During the day, according to a taxi driver I utilized, cruise ships can bring in about 10,000 people. So during the day, the number of people in Juneau can increase by 33%. That's a pretty big "daytime bulge" in the population and it makes me wonder what metro areas have larger "daytime bulges".

I guess you can experience a similar phenomenon with employment. ie. lots of people commuting into town for their day job. But I imagine most of these people live in the same metro area even if they don't live in the same city.

closed as off-topic by choster, Mark Mayo Jul 5 '18 at 3:26

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    I saw an article recently (but can't find it now) about Dubrovnik, saying their population can double when there are multiple cruise ships in port. It's become very a popular destination, in part because the HBO TV show "Game of Thrones" was filmed there. – Mike Harris Jun 27 '18 at 16:50
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    I'm not sure how this question is a practical problem related to travel; it doesn't even relate to travel or commute times as that depends not merely on the number of people but on the efficiency of the local transport network. – choster Jun 27 '18 at 16:53
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    I don't think this question is answerable. There likely isn't any systematic data collection on this. – gerrit Jun 27 '18 at 17:06
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    @gerrit You can compare the regular population vs. the number of tourists that come in. – Max Jun 27 '18 at 19:20
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    I'm voting to close this question as off-topic because it's not about travel. – Giorgio Jun 28 '18 at 11:28

By percentage, a fair guess would be Vatican City. It has a population of 1000 and sees as many as 20000 tourists per day, so it bulges by 1900%.

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    I'd consider Vatican City to be part of the Rome metropolitan area, population several million. – Nate Eldredge Jun 28 '18 at 3:46
  • Fair point but it is unclear if there is a true definition of metro area and if one would count as crossing international borders. – Itai Jun 28 '18 at 20:47

I imagine that Venice has the biggest day population bulge, both from cruise ships and regular tourists .

  • Since the question explicitly specified metro area, I would imagine Mestre and other parts of the mainland would count too -- so it's not clear that "regular tourists" wound constitute a significant "day bulge". For one, tourists who stay on the mainland and commute to Venice proper would still be staying in the metro area; for another the metro area has some 800.000 regular inhabitants. – Henning Makholm Jun 27 '18 at 19:07
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    [citation needed] – Roddy of the Frozen Peas Jun 28 '18 at 3:20

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