Cost of living in Boulder, Colorado (United States) is about the same as in Zwolle (Netherlands)
WARNING! This comparison is based on only a few data points. At this point it is only a guess. It is based on 275 prices entered by 36 different people.
For example, you would need at least €3,933 ($4,433) in Boulder, Colorado to maintain the same standard of living that you can have with €3,900 in Zwolle.