THE PHILADELPHIA LAND BRIEF
Land in the
Piedmont Uplands setting.
Philadelphia city has 134.3 square miles of land in Philadelphia County. Its Census reference point is in Piedmont Uplands, within Northern Piedmont.
Rounded low hills, open valleys and irregular plains form a transition between Appalachian highlands and the coastal plain. The underlying geology mixes metamorphic, igneous and sedimentary rocks.
Regional context: Northern Piedmont ↗ · Classification at the Census reference point
Philadelphia and Philadelphia County
Philadelphia is associated with Philadelphia County in the Census boundary data. Start with the parcel’s tax bill to match the property to that jurisdiction, then confirm which government handles its land use.
Philadelphia by land and water
The Census records 8.1 square miles of water within Philadelphia, or 5.7% of its total area. That share is close to Philadelphia County’s 5.7%. This is geographic context; waterfront status and usable land must be checked at the parcel.
For scale, Philadelphia city has 158.2 times the land area of nearby Oak Lane CDP (0.85 square miles). These areas describe boundaries, not comparable property prices.

