You've probably seen this, but have you looked for their marriage APPLICATION? There is often very useful information, such as names of parents, where they are from, etc. (What is available depends upon what was asked.)
Name Birth Date Marriage Date Marriage Location Spouse Victor E Pearson 1890 14 Apr 1912 Nicollet, Minnesota Lucille A Lawrence
Also, there is an excellent archive called the Swenson Swedish Immigration Research Center.