In today’s globalized and interconnected world, international relationships are becoming ever more important. This applies not only to political relations but also to transnational attachment, a positive and solidary mutual attitude between the citizens of two countries, which is mainly based on social capital and trust. In particular border areas can benefit enormously when people have a bond with their neighboring country and its inhabitants. Due to their geographic proximity and historically shaped identity, border regions have a high potential for increased economic and social exchange. While empirical work on these characteristics of specific border areas is scarce, this article presents a novel approach which applies the concept of transnational social capital taking the French–German border area as an example. The representative study is based on telephone interviews, which were conducted in the border area and in regions within the two countries as a control for country-level effects. We find strong evidence for border region attachment in form of higher levels of social capital and trust in the border area. Our findings have important implications for borderland economies in general and in particular for cross-border resilience with regard to prevailing risks like upcoming nationalism and disasters such as the Covid-19 pandemic.