Although many have hypothesized that neighborhoods and social context are important influences on the decision to vote, the data to study these phenomenon have often been inadequate. We examine a unique source of data, registered voter lists, from a rich variety of locations that allow us to tap into this social participation dynamic using a multilevel research design. We find that neighborhood context does have a socializing influence on voters, sometimes mobilizing them while at other times demobilizing them. Notably, this effect is separate from the effect of individual-level sociodemographic influences on participation and is manifest over and above these long- standing explanations.