This chapter introduces the topic of Perceptual Dialectology (PD), an area of sociolinguistics concerned with how nonlinguists understand dialectal variation. The chapter provides a brief history of the field and explores the ways in which the perceptions and language attitudes of nonlinguists have typically been elicited in research conducted within the modern tradition of PD with a particular focus on mental maps. Additionally, this chapter identifies ways in which these methods have been improved upon, specifically through the use of geographic information systems (GIS) tools. As an illustration of both the typical tools used in PD research and these recent advances in data analysis, a research project on the perceptions of dialectal variation within and across the state of Kentucky is presented.