[3] The district consists of the city of Cabuyao and adjacent municipalities of Bay and Los Baños.

It is currently represented in the 19th Congress by Ruth Mariano-Hernandez of the Lakas–CMD.

[4] Prior to its second dissolution in 1972, the district encompassed the eastern Laguna municipalities of Cavinti, Famy, Kalayaan, Liliw, Luisiana, Lumban, Mabitac, Magdalena, Majayjay, Nagcarlan, Paete, Pagsanjan, Pakil, Pangil, Rizal, Santa Cruz (the provincial capital), Santa Maria, and Siniloan.

Following the restoration of the Congress in 1987, it encompassed the southwestern Laguna municipalities of Bay, Cabuyao, Calamba, and Los Baños, with the creation of two additional districts in Laguna.

[5][6] Calamba was later separated from the district to form its own representation beginning in 2019;[7] however, it remained part of the 2nd Sangguniang Panlalawigan district until 2024 for the purpose of electing members of the Laguna Provincial Board.