This paper analyses the effects of EU integration on intra-EU trade volumes with a special focus on the evolution of trade within and between the core and the periphery countries. In the early phases of EU integration, there have been sizable trade creation and diversion effects with respect to EFTA countries. Both the creation and the diversion effects of EU membership have declined as the EU and EFTA have integrated. In all phases of EU integration, both core–periphery and intraperiphery growth of trade have experienced stronger positive effects than intracore trade. Hence, the EU enlargements did not cause any kind of intra-EU ‘peripherality’.