The city is currently represented in the lower house of the Congress through its lone congressional district.
Calamba was represented as part of the at-large district of Laguna in the Malolos Congress (1898–1899), National Assembly of the Second Philippine Republic (1943–1944) and Regular Batasang Pambansa (1984–1986) and the first district of Laguna from 1907 to 1941 and from 1945 to 1972.
Calamba was placed in the second district of Laguna in accordance with the apportionment ordinance of the new constitution which was proclaimed on February 11, 1987.
[1] Calamba was separated from the second congressional district of Laguna by virtue of Republic Act No.
Although Calamba is represented separately from the rest of Laguna in the House of Representatives of the Philippines, the city's residents remain part of the province's 2nd Sangguniang Panlalawigan district for the purpose of electing SP members.