What explains variation in populist radical right (PRR) support within Western democracies? Counterintuitively, and against both the popular narrative and prior research, PRR parties are often and increasingly stronger in areas seemingly removed from their key programmatic issues related to immigration and the effects of growing international economic and political integration. To explain this puzzle, I articulate a theory of residential constraints as a key driver of PRR support. I hypothesize that when citizens’ means of reacting to local conditions or “voting with their feet” are blocked, they are more likely to support PRR parties. Within a comparative, cross-national “most-different-systems” framework of Finland and France, I use a multi-method research design and exploit both quantitative and qualitative evidence to test this claim. I demonstrate that the PRR performs well in areas where access to services and opportunities are compromised, where locals are more residentially constrained, and where opportunities and incentives to relocate are blocked by economic considerations.