This study probes the relationship between legal precarity and transborder citizenship through the case of the Karen from Myanmar in Thailand. Collected through ethnographic multi-sited fieldwork between 2012 and 2016, interconnected individual life stories evolving across the Myanmar-Thailand border allow the critical interrogation of the political and legal categories of ‘migrancy’, ‘refugeeness’, and ‘citizenship’, teasing out their blurry boundaries in migrants’ experience. Following the recent critical research in legal ethnography, this study demonstrates that legal precarity is not simply an antithesis to citizenship. The social and legal dimensions of citizenship may diverge, creating in-between areas of not-yet-full-citizenship with varying levels of heft (Macklin 2007). The article consists of three parts. First, it offers a theoretical framework to reconcile the Karen legal precarity (even de facto statelessness) and citizenship, even on both sides of the border (legally impossible). Second, it presents the three groups of Karen in Thailand, produced by the interaction of three major waves of Karen eastward migration and tightening Thai citizenship and migration regulations: Thai Karen, refugees, and migrant workers. All three face varying levels of legal precarity of temporary status without full citizenship. However, the last part demonstrates the intertwined nature of those groups. A grassroots transborder perspective reveals the resilience of the Karen networks when pooling together resources of the hubs established on Thai soil by the three waves. Even the most recent arrivals in Thailand use those resources to move from one precarious legal status to another and even to clandestinely obtain citizenship.