Italy - Administrative divisions by population

Reference 1: Population.

Reference 2: Abruzzo, Aosta Valley, Apulia, Basilicata, Calabria, Campania, Emilia-Romagna, Friuli-Venezia Giulia, Lazio, Liguria, Lombardy, Marche, Molise, Piedmont, Sardinia, Sicily, Tuscany, Trentino-Alto Adige/Südtirol, Umbria and Veneto.

Source: http://en.wikipedia.org/wiki/Repubblica_Italiana