This article presents a new method for processing data gathered using the“draw-a-map” task in perceptual dialectology (PD) studies. Suchtasks produce large numbers of maps containing many lines indicatingnonlinguists’ perceptions of the location and extent of dialect areas.Although individual maps are interesting, and numerical data relating to therelative prominence of dialect areas can be extracted, an important value of thedraw-a-map task is in aggregating data. This was always an aim of thecontemporary PD method, although the nature of the data has meant that this hasnot always been possible. Here, we argue for the use of geographic informationsystems (GIS) in order to aggregate, process, and display PD data. Using casestudies from the United Kingdom and Germany, we present examples of dataprocessed using GIS and illustrate the future possibilities for the use of GISin PD research.