Grignano Polesine is a frazione of Rovigo with 3,000 inhabitants. It is approximately 8 km south of the town centre. With the name of Grignano di Polesine, assumed in 1867 after the precedent Grignano, it became an autonomous comune until 1927, when it became a frazione of Rovigo together with Boara Polesine, Borsea, Buso, Concadirame and Sant'Apollinare con Selva. The number of inhabitants, according to the past censi, was of 2,491 in 1871, 2,734 in 1881, 2,642 in 1901, 2,949 in 1911 and 3,186 in 1921.