[1] Before the start of trolley service between Ellicott City and Baltimore along Edmondson Avenue in 1899, this area was mostly undeveloped.

A stream feeding the Maiden Choice Run flowed along the course where Rock Glen Road was eventually built.

With easy access created by the trolley, construction of houses began in the northern portion of the neighborhood in 1913.

[2] The community popularly known as Westgate overlaps the city line, covering a portion of Baltimore County.

Homeowners in the Baltimore County neighborhood formerly known as Meridale Farms voted, in the 1930s, to become part of a single community association by the name of Westgate.