[LAB] German in Austria is claimed to be shaped by wide-spread dialect use and historical language contact. In this context, variation in prepositional phrases (PPs) is frequently cited, but still underresearched. Three linguistic variables are particularly interesting: (1) preposition choice (p-choice), (2) case marking in PPs and (3) preposition–determiner contractions. The present study aims at identifying linguistic and sociolinguistic – including regional – patterns of variation in the realization of PPs with two-way prepositions in German in Austria on the basis of natural production data including formal and informal registers from urban and rural adults of different age groups and different socioeconomic backgrounds living in Bavarian regions of Austria. The data were compared against the German standard variety from Germany to identify all constructions (possibly) specific for German in Austria. Results indicate that p-choice (particularly in directed motion constructions) shows mostly regional effects: South Bavarian varieties are characterized by preposition drop, whereas in the other regions, the preposition auf ‘on(to)’ seems overrepresented. However, case marking is more dependent on sociodemographic variables and accusative–dative syncretism appears more frequently in plural than in singular contexts. Finally, specific preposition–determiner contractions are widespread across all regions and groups investigated, even in (close-to-)standard registers.