AbstractFormal volunteering refers to an individual's unpaid contribution of time to the activities of a charitable or non‐profit organization. While the physical presence of these organizations is usually required for citizens who want to volunteer, neighbourhoods vary with respect to the amount of volunteering opportunities available. We are the first to geo‐code information on the location of registered charities and the location of individuals, using full six‐digit postal codes, to examine how the physical proximity of charities affects the decision to volunteer. We carefully address the possibility that proximity to charities might be endogenous: organizations and volunteers may respond to similar unobservable factors when deciding where to locate. Our results imply that access does matter for the decision to volunteer: one more charity within a 1 km buffer around an individual's residence increases the predicted probability of volunteering by 0.8%. The impact of an additional charity on the likelihood of volunteering decreases with distance from the individual's residence and is more pronounced for urban dwellers, providing further evidence that the location of charities matters when it comes to nudging individuals to volunteer.