Statistics are, as the etymology of the term suggests (state‐istics), intimately connected with the construction or administration of the nation‐state. This paper addresses the genesis and development of the nation‐state by studying one of the main instruments that states use to ‘embrace’ their populations, viz. population statistics. More particularly, the paper presents a critical analysis of the conceptual and ‘scientific’ representations of modes of belonging to the nation‐state as produced in the Belgian (Queteletian) population censuses from the mid‐nineteenth until the mid‐twentieth century. It is shown how the analyses of the statisticians' interests, techniques and classification schemes shed light on the various ways in which inclusion in, or exclusion from, the Belgian nation‐state have been articulated in its population censuses. It is argued that these shifting interests and classification schemes also inform us about the construction and administration of the contemporary nation‐state.