Members of a minority population are expected to evaluate political authorities through a different spectrum than majority members. Still, only a few studies have explored the role of local conditions as determinants for political attitudes among a linguistic minority population. This study focuses on the role of linguistic homogeneity, local economic conditions and community size as determinants for corruption perceptions and political trust at the individual level among members of a linguistic minority population: the Swedish-speaking Finns. Moreover, this study differs empirically between evaluations of the local and national authorities. Combining data from a panel survey collected by Barometern (2019-21) with varying contextual-level factors in a multilevel model, we show that evaluations of local authorities are related to local contextual factors, in particular municipal unemployment rates and median incomes, while national evaluations are largely unrelated to local conditions. In contrast to theoretical expectations for an in-group bias among minority members, however, we find no effect for linguistic homogeneity on corruption perceptions and political trust after controlling for economic conditions. The results make an important contribution to our understanding about the role of local conditions for political attitudes among a well-assimilated minority population.