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Allocating charging infrastructure to support the plug-in electric vehicle (PEV) market transition is a major challenge for policy makers and planners seeking to promote PEV adoption. Most electric vehicle charging away from home takes place at or near the workplace, but existing research is focused on public charging. This study developed a method to combine charging location data from a variety of sources including users’ self-reports to produce a combined database of workplace and public charging locations. By matching survey responses to charging locations reported in other datasets using spatial clustering methods, we estimated the number of charging locations and chargers in California. This analysis found that charger location datasets from the Alternative Fuels Data Center and Plugshare included many of the same charging locations as each other but missed many chargers that serve commuters; as …