[3] The district consists of the city of Baliwag and the municipalities of Bustos and Plaridel.

It is currently represented in the 19th Congress by Tina Pancho of the National Unity Party (NUP).

[4] Prior to its second dissolution in 1972, the second district encompassed the eastern Bulacan municipalities of Angat, Baliuag (Baliwag), Bocaue, Marilao, Meycauayan, Norzagaray, Obando, San Ildefonso, San Jose del Monte, San Miguel, San Rafael, Santa Maria, and Valenzuela (formerly Polo).

[7] Following the restoration of the Congress in 1987, the district was reconfigured to encompass Balagtas, Baliwag, Bocaue, Bustos, Guiguinto, Pandi, and Plaridel, amid the addition of two districts for Bulacan.

[8][9] Balagtas, Bocaue, Guiguinto, and Pandi were later excised from the district to form the fifth district effective 2022, leaving it with three in its current jurisdiction.