Frederick Avenue (Maryland Route 144) marks the neighborhood's boundary to the north; Wilkens Avenue (Maryland Route 372) draws its southern edge.

[1] Also known as the Frederick Road station, Carroll Station took its name from Charles Carroll of Carrollton, whose family previously owned the property now occupied by the Gwynn's Fall neighborhood.

[2] Maryland Brush Company, a manufacturer of industrial brushes, was located at 3221 Frederick Avenue in the Gwynn's Falls neighborhood since the company’s founding in 1851.

[3] After losing their most significant customer in 2019, the employee owners agreed to sell the company.

The location in Gwynn’s Falls closed in 2020 when the company’s assets and operations were purchased by Felton Brushes, Limited, a manufacturer in Ontario, Canada.