Vote-buying is a significant problem in developing democracies. If reports of vote-buying crimes are high, results may be challenged by competing candidates in electoral courts, and violent political confrontation may erupt. Also, if not prosecuted, there is danger of vote-buying becoming a common feature of electoral processes. This study assessed the magnitude and correlates of vote-buying crime reports during the 2006 elections in Mexico. It made use of the United Nations Development Program (UNDP) survey on the Protection of Federal Social Programs of 2006 (ENAPP). Results showed that 8.8% of the survey respondents nationwide who were not beneficiaries of any federal social program reported to have been offered something in exchange of their vote, that is, a vote-buying crime under the legislation of Mexico. Ordinal logistic regression showed five independent correlates of vote-buying crime reports: Years of schooling, Indian language speaking, municipal marginality, population size, and PRD versus PAN governed municipalities. The paper discusses the reasons and consequences by suggesting other aspects to consider for future research.