People are concerned about misinformation and media coverage of the problem is on the rise. Yet little is known about how concerns about misinformation have changed over time, and how they vary across countries and individuals. A pre-registered analysis of longitudinal data from 2018 to 2023 in 46 countries (N = 509,797) shows that concerns about misinformation have remained stable in most countries. Women, more educated, older, and right-wing respondents were more concerned about misinformation, together with respondents using social media for news and participating with news more often (e.g., talking about news). Countries with higher levels of concern about misinformation had lower GDP per capita, lower press freedom, and higher levels of corruption. In these countries, respondents were more concerned about misinformation on messaging apps and misinformation coming from their government rather than from foreign governments. These findings shed light on the correlates of misinformation and suggest that interventions against misinformation need to adapt to the information ecosystems in which they are deployed.