Slavic languages make up one of the largest and most homogenous branches of the Indo-European language family. In all, more than 315 million people around the world speak a Slavic language. Principal languages include: Russian (170 million), Polish (44 million), Ukrainian (41 million), Serbo-Croatian (20 million), Czech (12 million), Bulgarian (9 million), Macedonian (2 million), Belarusian (10.2 million), Slovakian (5.6 million) and Slovenian (2.2 million). Southern Slavic: Slovenian, Serbo-Croatian, Bulgarian, and Macedonian. Western Slavic: Polish, Czech, and Slovakian. Eastern Slavic: Russian, Belarusian, and Ukrainian.