Polanco is a landlocked municipality in the coastal province of Zamboanga del Norte.

The municipality has a land area of 206.88 square kilometers or 79.88 square miles which constitutes 2.83% of Zamboanga del Norte’s total area. Its population as determined by the 2020 Census was 42,265. This represented 4.04% of the total population of Zamboanga del Norte province, or 1.09% of the overall population of the Zamboanga Peninsula region. Based on these figures, the population density is computed at 204 inhabitants per square kilometer or 529 inhabitants per square mile.