While the media pay the most attention to the actions of the national political committees, political scientists have long emphasized the key role of local party organizations. Despite sweeping changes in the political environment, remarkably little research has sought to understand precisely how these local parties are structured, what they do, and whether they have any impact on the political system. In Local Party Organizations in the Twenty-First Century, Douglas D. Roscoe and Shannon Jenkins use data collected from more than 1,100 local parties in forty-eight states to provide the most thorough examination of the role of local political parties in the US political system, something that has been lacking in contemporary accounts of the role of parties. They show that party organizations take particular forms and engage in certain activities because political actors find these forms and activities useful for winning elections. While past research has centered primarily on the role of national and state political parties in the United States, this book demonstrates the continuing central role of local political parties in the electoral process, providing readers with a more comprehensive understanding of the US party system.