PrecinctsReporting NYC is an interactive tool for mapping historical election results in New York City block-by-block. The tool includes most contested city and state races since 2005, including the 2009 mayoral race. 

Choose from a variety of map shading options to illuminate the data in different ways. Tabulate and visualize election returns by borough, Assembly, or election district. Use the correlation tool to compare support for any three candidates by district. Cross reference election maps with Google Street View. Share maps with your friends on Twitter.