Say Bulacan et unaan ya klase a luyag ed rehiyon na Pegley na Luzon, Filipinas. Unong ed 1 Mayo 2020 census, say populasyon to et 3,708,890 totoo tan 920,608 abong. Walay kabaleg tan sukat to ya 2,796.10 sq. km. Say kodigo telefono +63 (0)44. Say kapital to et Malolos.
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Census of Population (2015). "Region III (Central Luzon)". Total Population by Province, City, Municipality and Barangay. PSA. Retrieved 29 June 2016.
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Census of Population and Housing (2010). "Region III (Central Luzon)". Total Population by Province, City, Municipality and Barangay. NSO. Retrieved 29 June 2016.