Data has become an increasingly important commodity for news organizations. The capability to extract, store, and analyze data is also central to organizational decision-making. Drawing on the concept of epistemic infrastructures, this study sheds light on organizational datafication in journalism. Analyzing job advertisements of incumbent broadcast, print legacy, and online-only news outlets in the US and UK, this study traces material underpinnings of data architectures, networks of data agents, and epistemic data paradigms in news organizations. We show that a professional data elite of data analysts, engineers, and product developers serves as an epistemic community that consolidates power through epistemic authority and reinforces epistemic paradigms in journalism. We describe epistemic data infrastructures in the journalistic field and highlight how reliance on these infrastructures contributes to ethical challenges that news organizations are ill-equipped to address. We conclude that news organizations are deeply engaged in fostering epistemic infrastructures and that by acknowledging them, we can better analyze socio-technological changes in journalism and its consequences.