The Scandinavian countries are often cited as examples of countries where cohabitation is largely indistinguishable from marriage. Using survey data from Norway and Sweden (N = 2,923) we analyzed differences between cohabitors and married individuals in relationship seriousness, relationship satisfaction, and dissolution plans. Our analyses reveal that cohabitors overall are less serious and less satisfied with their relationships and are more likely to consider ending their current relationships than are married respondents. The views of cohabitors who report that they intend to marry their current partners within 2 years, however, differ much less from those of married respondents than cohabitors with no marriage plans. This finding suggests that even in Scandinavia cohabitors are a heterogeneous group.