Millbourne
| Borough of Millbourne | |
| Borough | |
 Millbourne SEPTA station
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| Country | United States |
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| State | Pennsylvania |
| County | Delaware |
| Elevation | 128 ft (39.0 m) |
| Coordinates | 39°57′48″N 75°15′14″W / 39.96333°N 75.25389°WCoordinates: 39°57′48″N 75°15′14″W / 39.96333°N 75.25389°W |
| Area | 0.07 sq mi (0.2 km2) |
| - land | 0.07 sq mi (0 km2) |
| - water | 0.0 sq mi (0 km2), 0% |
| Population | 1,159 (2010) |
| Density | 16,557.1/sq mi (6,392.7/km2) |
| Timezone | EST (UTC-5) |
| - summer (DST) | EDT (UTC-4) |
| Area code | 610 and 484 |
 Location in Delaware County and the state of Pennsylvania.
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.svg) Location of Pennsylvania in the United States
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 Millbourne: Getting Back on Track, 16:53, Grapple, Keystone Crossroads |
Millbourne /ˈmɪlbərn/ is a borough in Delaware County, Pennsylvania, United States. The population was 1,159 at the 2010 census. Millbourne borders Philadelphia along Cobbs Creek. The borough is not part of neighboring Upper Darby, although Millbourne students attend Upper Darby School District schools. Magisterial courts with presiding jurisdiction for Millbourne are also located in Upper Darby.
Millbourne, at over 16,000 people per square mile, is the most densely populated incorporated place in Pennsylvania, and 22nd in the entire United States.
Millbourne Borough is located at 39°57′48″N 75°15′14″W / 39.96333°N 75.25389°W (39.963412, -75.253998).
According to the United States Census Bureau, the borough has a total area of 0.1 square miles (0.2 km2), all land, making it the smallest municipality in Delaware County, Pennsylvania by area.
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