Sirawai is a coastal municipality in the province of Zamboanga del Norte.
The municipality has a land area of 222.50 square kilometers or 85.91 square miles which constitutes 3.05% of Zamboanga del Norte’s total area. Its population as determined by the 2020 Census was 31,163. This represented 2.98% of the total population of Zamboanga del Norte province, or 0.80% of the overall population of the Zamboanga Peninsula region. Based on these figures, the population density is computed at 140 inhabitants per square kilometer or 363 inhabitants per square mile.