The Borough of Brentwood, located in Allegheny County, was originally part of Baldwin Township and included the villages of Brentwood, Pointview and Whitehall and was, at that time, one of the most densely populated parts of the township. Its 880 acres covered approximately one-tenth of the township and was known as Precinct Number 2. It now contains 929.9 acres, or 1.4517 square miles. This increase was due to a change of boundaries in the Brentwood Villa plan of lots, Willet-Kingsley Avenue area. In 1929, 60% of the residents of this Brentwood Villa Plan petitioned Brentwood Borough Council to annex this section and this was subsequently done.