This paper explores the localness of Greek prefectures according to the methodological approach of economic base and, specifically, the minimum requirements technique, which leads to the estimation of a localness index for each group of prefectures of similar population size. Hence, through the definition of the types of areas that enhance their localness, the determination of the spatial pattern and the causes of these changes could be better investigated. According to the results of the research, a growing localness in all groups of prefectures during the period 2000–2009 has emerged. Localness seems high in a group with the highest population and largest urban concentrations, enhancing their ability to be largely self‐powered locally. Localness is high in the smallest group too, which is characterized by the pattern of integrated spatial development. Thus, without underestimating the importance of exports and imports, it makes more sense to look at localness and extroversion together in order to achieve greater development.