The profile of voters and nonvoters according to age, occupation, and education is described. The study is based on samples of around 30 male mesas from the city of Buenos Aires in four presidential elections—1983, 1989, 1995, and 1999—and 100 from each of two elections (1997 representatives and 1999 presidential) in the homonymous province. Data from official voter registers (padrones) are analyzed for those obligated to vote (18-69) and for those exempted (70+ years). The level of abstention increased slowly but steadily along the time span considered. Citizens obligated to vote do so more than those who are not. Logistic regression equations showed a positive effect of the lowest occupational status categories—less educated people—on the odds of nonvoting, while the opposite was true for the highest occupational status categories.