Utilizing a large and unique dataset composed of government records, we study the widely contested effect of co‐ethnic residential concentrations on voter turnout. Non‐Western immigrants are moderately affected by the concentration of co‐ethnic voters in their neighborhoods. As the local concentration of same‐ethnicity voters increases, so does the individual's propensity to turn out for the election. In general, the concentration of non‐Western immigrants in the neighborhood has only a very limited impact on an immigrant's propensity to vote. Finally, we investigate the possible mobilizing effect of local candidates and, in particular, local co‐ethnic candidates on voter turnout. We find that the presence of candidates in general and co‐ethnic candidates running for office in a neighborhood has a moderate positive mobilization effect. However, taking this factor into account, the effect of residential concentrations was not eliminated.