Bulacan is a province in the Philippines situated in the Central Luzon region occupying the central section of Luzon. Its capital is the City of Malolos.

The province has a land area of 2,783.69 square kilometers or 1,074.79 square miles. Its population as determined by the 2020 Census was 3,708,890. This represented 29.86% of the total population of the Central Luzon region, 5.96% of the overall population of the Luzon island group, or 3.40% of the entire population of the Philippines. Based on these figures, the population density is computed at 1,332 inhabitants per square kilometer or 3,451 inhabitants per square mile.

-https://www.philatlas.com/luzon/r03/bulacan.html