This article proposes a novel two-level instrument for analytically robust distinction of typological differences in the area of rule of law (ROL) among the European countries. The first level of analysis uses the EC’s first anti-corruption report data for a cumulative calculation of the country’s rank of anti-corruption potential. This procedure is repeated on a higher level of aggregation, wherein the EC’s anti-corruption ranking is combined with the rankings of the World Press Freedom and Rule of Law Indices. Thus, the authors create a database for the second level quantitative instrument, which is a variation of cluster analysis. The stable clusters obtained do not coincide with conventional blocks of countries that figure in the academic literature. The instrument for the measurement of the ROL ranking could be even more important for the assessment of the advancement of the candidate-states toward their full compliance with the EU ROL standards.