Millbourne Borough is a self-governing municipal borough in Delaware County, Pennsylvania, United States. As of the 2020 census, the population is 1,212. Millbourne borders Philadelphia along Cobbs Creek. The name "Millbourne" comes from the word Mill and "bourne" meaning creek. Millbourne, at over 17,000 people per square mile, is the most densely populated incorporated place in Pennsylvania, and 24th in the entire United States.
The Market–Frankford Line in Millbourne
Millbourne Mills was located on present-day 63rd and Market Streets in Millbourne.
Millbourne homes built along Market Street (formerly West Chester Pike)
A house in Millbourne built during the early 20th century.
Delaware County, Pennsylvania
Delaware County, colloquially referred to as Delco, is a county in the Commonwealth of Pennsylvania. With a population of 576,830 as of the 2020 census, it is the fifth-most populous county in Pennsylvania and the third-smallest in area. The county was created on September 26, 1789, from part of Chester County and named for the Delaware River. The county is part of the Southeast Pennsylvania region of the state.
Delaware County Courthouse in Media, Pennsylvania
The old Chester Courthouse, built in 1724
Bartram's Covered Bridge, built 1860 west of Newtown Square, crosses Crum Creek into Chester County
Newlin Mill, built 1704, on the west branch of Chester Creek, near Concordville
