The population of Helsinki is 658,457 (Dec 31, 2021). However, there are more than 1.5 million people living in the Helsinki region, including the nearby cities
Stockholm
The population of Stockholm is estimated at 910,000 in 2016 with a population density of 4,800 people per square kilometer, or 13,000 per square mile
Tallinn
The population of Tallinn on 1 January 2021 was 438,341. It is the most populous and primate city of Estonia, and the 59th most populated city in the EU
Sankt-Peterburg
And here we get home. It takes 5 days, chillin&restin all the time!