Traditionally, research on late Iron Age societies of Central Europe has to some degree focused on large fortified settlements or oppida, presumably ranking at the top of the Celtic settlement hierarchy. The oppidum of Manching in Upper Bavaria has in the past been seen as a paradigmatic example of pre-Roman transalpine urbanization, in both chronological and functional terms. However, both its dating and its topographical position in a shallow flood plain of the Danube justify a distinction from contemporaneous or successive fortified ‘towns'. Recent studies have identified another particular type of settlement – large unfortified centres of crafts and trade – as a major feature of prehistoric urbanization. Again, Manching and its pre-fortified stages of urban development reveal a characteristic scheme of eastern Celtic settlement evolution that eventually breaks with a standard development when a massive rampart is constructed. Based on recent research at Manching and its hinterland, and taking into account the dynamic character of urbanization, a flexible model of urban evolution is developed here. This model allows for a comparative and quantifiable notion of variable degrees of local and supra-regional urban status.