In all years, average income disparities between regions explain only a modest fraction of overall inequality, with this contribution ranging from 1% (in Belgium) to 6% (in Hungary) in 2010. However, this low contribution of the between region inequality is a consequence of the use of large regions as geographic units for the analysis here presented. Moreover, cross-country comparisons of the between-region component of the Theil index are highly affected by the number of regions present in each country. It is thus more relevant to look at the evolution over time of the between-and within- components of income inequality for each country.