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 287 prices entered by 38 different people.
For example, to keep the same standard of living that would require €3,700 in Zwolle you would need to make just about €3,568 ($4,174) in Boulder, Colorado.