The article studies to what extent regional socioeconomic and cultural characteristics explain spatial patterns in the Second Demographic Transition in Finland. The country's 75 functional regions are used as area units. A summary indicator of the transition based on divorce and cohabitation is used as the dependent variable. The results show that the spatial pattern is mainly determined according to the regional level of urbanization, but the effect is mediated by cultural characteristics (secularization and support for the socialist and green parties). The cultural characteristics have only a modest independent effect.