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is a census-designated place (CDP) in Lower Merion Township, Montgomery County, Pennsylvania, just west of Philadelphia along Lancaster Avenue (US-30) and the border with Delaware County. Bryn Mawr is located towards the center of what is known as the Main Line, a group of wealthy Philadelphia suburbs stretching from the city limits to Paoli. It is also home to Bryn Mawr College and as of the 2000 census, it had a population of 4,382. The name
means "big hill" in Welsh and takes its name from an estate near Dolgellau in North Wales. This was the farm of Rowland Ellis, who emigrated to Pennsylvania from Dolgellau in 1686 to escape religious persecution.
Until 1869 and the coming of the Pennsylvania Railroad, the town was known as Humphreysville. The town was renamed by railroad agent William H. Wilson after he acquired on behalf of the railroad the that now comprise Bryn Mawr.
According to the United States Census Bureau, the CDP has a total area of 0.6 square miles (1.6 km²), all land and entirely within Lower Merion Township in Montgomery County. However, the "Bryn Mawr" zip code (19010) covers a larger area and, as a result, the geographic term "Bryn Mawr" is often used in a sense that includes not only the CDP, but also other areas that share the zip code. These other areas include the community of Rosemont within Lower Merion Township and Radnor Township, and various other areas within Lower Merion Township, Radnor Township, and Haverford Township. As of the 2000 Census the Bryn Mawr ZIP code, 19010, was home to 21,485 people with a median family income of $110,956.