Using data on 11,000 graduate students from 100 departments over a 20 year period, I test whether graduate student outcomes (graduation rates, time to degree, publication success, and initial job placement) differ based on a student's gender and marital status. I find that married men have better outcomes across every measure than single men. Married women do no worse than single women on any measure and actually have more publishing success and complete their degree in less time. The outcomes of cohabiting students generally fall between those of single and married students. Appended are: (1) Differences in other outcomes by gender and marital/cohabitation status; and (2) Differences in other outcomes by gender and marital/cohabitation status. (Contains 2 figures, 7 tables and 3 footnotes.)