This project was designed to address the problem of point-of-purchase tobacco advertising through media advocacy and community mobilization. Precampaign assessment revealed a considerable amount and density of tobacco advertising and promotions in more than 100 stores sampled in San Jose, California. After sharing the results with community activists and other residents, a community mobilization campaign was instigated to capitalize on an existing sign control ordinance that limits store window coverage and sidewalk signs. Through presentations and media advocacy efforts, community residents were mobilized to file complaints with the city's code enforcement office when neighborhood stores were shown to be noncompliant with ordinance provisions. Relative to the baseline, significant reductions in campaign-related tobacco advertising variables were seen in the San Jose stores after the sign law campaign. No changes were seen in four smaller reference communities. Differences were noted between stores close to and farther away from schools. These results demonstrate that mobilization of community residents to activate enforcement of laws originally designed for other purposes can have a significant impact on one aspect of tobacco point-of-purchase advertising.