This chapter investigates whether metropolitan citizens’ attitudes towards transnationalism have polarised since the 2010s. Using European Social Survey data, it analyses Eurosceptic and nativist views across big city centres and outskirts in major European metropolises. The findings reveal that suburban residents are consistently more Eurosceptic and nativist than inner-city dwellers, and that these differences widened during the decade of economic and migration crises. Attitudinal gaps peaked in the early 2010s, highlighting the salience of crisis periods in crystallising divides. The chapter concludes that public opinion within metropolises has become increasingly structured along the transnational cleavage, with metropolitan polarisation reflecting deeper cultural conflicts triggered by globalisation and its discontents.