For some time been it has been hypothesized that involvement in civic associations creates generalized social trust. Yet, prior panel data studies, based mainly on data collected in Australia, the Netherlands, Switzerland, the United Kingdom, and the United States, have found little support for the existence of such an effect. This article adds further empirical knowledge, focusing on Sweden. The evidence presented here is the first to provide support for the hypothesis using a survey that allows panel data models. In the conclusions, it is discussed whether the differing findings may depend on Sweden being a particularly favourable environment, considering its comparatively democratic and prosperous associational life; or if the reason is that the data at hand do not allow using exactly the same panel models as in some of the prior studies.