Masantol is a landlocked municipality in the coastal province of Pampanga.
The municipality has a land area of 48.25 square kilometers or 18.63 square miles which constitutes 2.41% of Pampanga's total area. Its population as determined by the 2020 Census was 57,990. This represented 2.38% of the total population of Pampanga province, or 0.47% of the overall population of the Central Luzon region. Based on these figures, the population density is computed at 1,202 inhabitants per square kilometer or 3,113 inhabitants per square mile.