The SF Bay Area has a population that is 75% of Sweden’s entire population.
SF itself is more densely populated than Sweden’s most densely populated city which appears to be Stockholm (7700/km^2 vs 5000/km^2). Stockholm has a population around 20% larger than SF.
According to Wikipedia, California is smaller than Sweden.
So there may be some dense pockets in Sweden but it certainly isn’t more densely populated than California and it doesn’t appear that there are large cities that approach the density of NYC/SF.
SF itself is more densely populated than Sweden’s most densely populated city which appears to be Stockholm (7700/km^2 vs 5000/km^2). Stockholm has a population around 20% larger than SF.
According to Wikipedia, California is smaller than Sweden.
So there may be some dense pockets in Sweden but it certainly isn’t more densely populated than California and it doesn’t appear that there are large cities that approach the density of NYC/SF.