This book considers local autonomy, measured as a multidimensional concept, from a cross-country comparative perspective, and examines how variations can be explained and what their consequences are. It fills a gap in the literature by providing a comprehensive study of the different components of local autonomy across a large number of countries, over time. It offers a theoretically saturated concept to measure local autonomy and applies it to 39 countries, including all 28 EU member states together with Albania, Georgia, Iceland, Liechtenstein, Macedonia, Moldova, Norway, Serbia, Switzerland Turkey and Ukraine, over a period of 25 years (1990-2014).