What is the effect of residing in ethnic enclaves on immigrants’ future political participation? We study a comprehensive refugee placement reform that was implemented in Sweden in the mid-1980s in combination with unique individual-level turnout data to study the causal effect of being settled in neighborhoods with a high residential concentration of coethnics on immigrants’ future probability of voting. We find little evidence that ethnic concentration per se affects voter turnout. On average, newly arrived immigrants were equally likely to vote whether they were placed in a neighborhood with many or few coethnics. Further analyses, however, indicate that the effect of ethnic concentration depends on the degree of political integration among previously settled coethnics; ethnic concentration increases turnout among the newly immigrated when they are placed with already politically integrated coethnics. These results underscore the conditions under which the political socialization of immigrant newcomers is enhanced in ethnic enclaves.