Objectives. We compared the social participation of older adults living in metropolitan, urban, and rural areas, and identified associated environmental factors. Methods. From 2004 to 2006, we conducted a cross-sectional study using an age-, gender-, and area-stratified random sample of 1198 adults (aged 67-82 years). We collected data via interviewer-administered questionnaires and derived from Canadian censuses. Results. Social participation did not differ across living areas (P = .09), but after controlling for potential confounding variables, we identified associated area-specific environmental variables. In metropolitan areas, higher social participation was associated with greater proximity to neighborhood resources, having a driver's license, transit use, and better quality social network (R-2 = 0.18). In urban areas, higher social participation was associated with greater proximity to neighborhood resources and having a driver's license (R-2 = 0.11). Finally, in rural areas, higher social participation was associated with greater accessibility to key resources, having a driver's license, children living in the neighborhood, and more years lived in the current dwelling (R-2 = 0.18). Conclusions. To enhance social participation of older adults, public health interventions need to address different environmental factors according to living areas.