[3] The district consists of the southwestern Rizal municipalities of Angono, Binangonan, Cainta and Taytay.

It is currently represented in the 19th Congress by Michael John R. Duavit of the Nationalist People's Coalition (NPC).

[4] Prior to its second dissolution in 1972, the district encompassed the former western Rizal municipalities and cities of Caloocan, Las Piñas, Makati, Malabon, Mandaluyong, Muntinlupa, Navotas, Parañaque, Pasay, Pateros, San Juan, and Taguig, as well as the western part of Quezon City, which had previously belonged to Caloocan and San Juan; such area now forms the majority of the present-day Metro Manila.

After the creation of Metro Manila in 1975, it encompassed Antipolo and the southwestern part of the reduced province of Rizal beginning in 1987.

In 1998, Antipolo was separated from the district to form its own representation as a newly converted city, leaving the four remaining municipalities in its current jurisdiction.