In this study we examine over- and undervotes from the November 2000 General Election in Los Angeles County. Los Angeles County is the nation’s largest election jurisdiction, and it used a punchcard voting system in that election. We use precincts as our unit of analysis and merge the 2000 election data with census data and voter registration data; our dataset allows us to examine all of the countywide races in 2000 (including candidate and ballot measures). We use a multivariate statistical analysis employing negative binomial regression to test hypotheses regarding the relationship between precincts’ political and demographic characteristics and over-and undervotes. We demonstrate that both over- and undervotes vary systematically across precincts in Los Angeles County, a finding that we argue has important implications for the representation of political interests.