The effects of cohabitation length prior to marriage were tested. Using control variables and dependent measures employed by Stafford, Kline, and Rankin (2004) to measure personal and relational well being, response data were used from 1,343 still-married participants who completed the National Survey of Families and Households (NSFH). The results indicated that greater length of cohabitation before marriage slightly increased respondents’ likelihood of managing conflicts with heated arguing, hitting and throwing. The longer respondents cohabited before marriage, the greater their likelihood for depression, dependency and perceived risk of separation. Conversely, current relationship satisfaction declined as cohabitation length before marriage increased.