[6] The municipal jurisdiction also includes the islands of Maniwaya, Mongpong, Salomague, and Santa Cruz (also known as Polo Island), as well as several minor islets.

Santa Cruz is 29 kilometres (18 mi) from Boac.

In 1957 the sitio of Kalangkang, barrio of Kasily, was converted into a barangay.

[8] In the 2020 census, the population of Santa Cruz, Marinduque, was 54,692 people,[3] with a density of 200 inhabitants per square kilometre or 520 inhabitants per square mile.

Poverty incidence of Santa Cruz Source: Philippine Statistics Authority[14][15][16][17][18][19][20][21] Access to the municipality: