Mandaluyong has a total land area of 1,124.97 hectares.
This constitutes 1.77 % of the 636 sq. km. total land area of Metro Manila which is composed of 15 cities and 2 municipalities.
The city is composed of 27 barangays, divided into two (2) political districts.
The largest is Brgy. Wack-Wack, which comprises a little over one-fourth (294.48 has.) of the city’s total land area. Next is Brgy. Addition Hills, which comprises almost fifteen percent (162 has.), followed by Brgys. Plainview and Highway Hills at about ten percent each, or 115.92 and 105.12 has. respectively (Table 1.01).