Increases in the rates of interracial and interreligious couples within the U.S. have occurred seemingly in tandem with the rise of the Internet and online dating, but the evidence connecting online sources of romance and couple heterogeneity have been limited and mixed. Using a unique dataset collected in 2009 and again in 2017 on how U.S. couples met, and controlling for the diversity of their local geographies, I find that couples who met online are more likely to be interracial, interreligious, and of different college degree status, but also more similar in age. These differences can vary by where on the Internet couples met, with online dating websites and apps showing a clear effect on increased age assortativity, while other online sources of partners do not. Populationlevel estimates suggests that only a small part of the recent changes in couple diversity can be directly attributed to couples meeting online, but there is the potential for more Internet-induced change if it becomes the primary source of romantic introductions.