This paper aims to identify and analyze geographical patterns of (morpho)syntactic variation in traditional Austrian dialects using non-aggregative dialectometric methods (factor analysis). Based on a comprehensive dialect corpus obtained by direct dialect interviews including 163 speakers from 40 locations throughout Austria, our analyses of 79 variants of 30 (morpho)syntactic variables not only show geographical patterns in Austria’s dialects, but also address the linguistic basis of the geographical structures revealed. In particular, the results show that variables at the morphology–syntax interface contribute most to geographical structuring. We argue that this finding is related to structural conditions of these variables and the historical development of the respective variants.