The Tondo Province annexed to this new district the towns of Cainta, Taytay, Antipolo and Boso-boso, while Laguna contributed the towns of Angono, Binangonan, Cardona, Morong, Baras, Tanay, Pililla and Jalajala.
After Masinag the road starts its ascent towards the Sierra Madre passing through Tanay, Rizal, finally to Infanta, Quezon.
This consisted of the towns of Antipolo, Bosoboso, Cainta and Taytay from the Province of Tondo; and the towns of Morong, Baras, Tanay, Pililla, Angono, Binangonan and Jalajala from the Province of La Laguna, with the capital at Morong.
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Antipolo, Taytay and Cainta serve as the economic centers of the province, while Angono, Rodriguez, Morong, San Mateo, Tanay, Binangonan and Teresa are taking successful steps to urbanize areas within their jurisdiction.