Pinagkaisahan is characterized as gradually sloping downwards from the west towards the northeast, where a creek (Balisampan) cuts across the barangay. Inner parts of the barangay are mostly residential while alongside EDSA are classified commercial. Pinagkaisahan, by clustering, is in District II under the North Central Cluster along with Guadalupe Nuevo, South Cembo, Post Proper Southside, and Pitogo. Also, the barangay boasts its proximity in two (2) Central Business Districts – Ayala and the Bonifacio Global City.
The population count as per 2010 Census of Population is 5,804, with approximately 1,161 households at 5 household size. The average population density of the barangay is estimated at 36 per 1,000 square meters considering a land area of 0.1603 square kilometers.