This study investigated the correlates of relationship satisfaction, marriage expectations, and relationship longevity among unmarried African American and Black Caribbean (Caribbean Black) adults who are in a romantic relationship. The study used data from the National Survey of American Life, a national representative sample of African Americans and Caribbean Blacks in the United States. The findings indicated that the correlates of relationship satisfaction, expectations of marriage, and relationship longevity were different for African Americans and Black Caribbeans. For Black Caribbeans, indicators of socioeconomic status were particularly important correlates of relationship satisfaction. For African Americans, indicators of parental status were important for relationship longevity. Policy and practice implications for nonmarital unions are discussed.