This study examines the relationship between volunteer socioeconomic status (SES) and voluntary organization involvement among older adults. Using longitudinal data from the Americans' Changing Lives surveys, this study assesses the effects of education and income on the type and scope of voluntary organization involvement. Multiple imputation and generalized estimating equations methods are used in the data analysis. The results indicate that more highly educated, older adults are more likely than their less-educated counterparts to volunteer in all five types of organizations (i.e., religious, educational, political, senior citizen, and others), volunteer in a wider range of organizations, and devote more hours. However, income makes little significant difference in organizational volunteering. Voluntary organizations are advised to facilitate older adults from diverse socioeconomic backgrounds in taking volunteer roles. Innovative recruitment programs are needed to tap the resource for volunteering that elders from all SES groups represent.