Looks like it’s 380 in the Swiss Plateau (you might be mixing up sq km and sq mi), which puts its at about ~70% of the population density of the Netherlands as

Looks like it’s 380 in the Swiss Plateau (you might be mixing up sq km and sq mi), which puts its at about ~70% of the population density of the Netherlands as a whole. https://en.wikipedia.org/wiki/Swiss_Plateau https://en.wikipedia.org/wiki/Swiss_Plateau