Somaglia (Lodigiano: Sumaia) is a comune (municipality) in the province of Lodi in the Italian region of Lombardy, located about 50 km southeast of Milan and about 20 km southeast of Lodi. As of 31 December 2004, it had a population of 3,384 and an area of 20.9 km2. The municipality of Somaglia contains the frazione (subdivision) San Martino Pizzolano. Somaglia borders the following municipalities: Casalpusterlengo, Codogno, Ospedaletto Lodigiano, Senna Lodigiana, Fombio, Calendasco, Guardamiglio.

Demographic evolution