County · code 42101
Philadelphia CountyPennsylvania
Philadelphia County is located in Pennsylvania and was created in 1682 as one of three original counties, with Philadelphia as its county seat.
- Founded1682
- County seatPhiladelphia
- Named forPhiladelphia
- Land area134 sq mi + 8.3 sq mi water
- Population1,603,797 2020 Census
- Parcels mapped547,105 checked 14 October 2026
Where it is
Philadelphia on the map of Pennsylvania
Pennsylvania has 67 counties and county equivalents, each with its own records office. Shapes with a page are links.
History
Founded in 1682
An old deed may name a county that no longer exists, or a boundary that has since moved.
Philadelphia County was created in 1682 but had no territorial limits specified until 1685. The county lost territory to the creation of Berks County in 1752 and to Montgomery County in 1784.
- 1682Philadelphia County created In 1682, Philadelphia was created as one of three original counties, no territorial limits were specified. · Bronner, 31-35; Hottenstein and Welch, 24, 37, 108; Penn, 2:299
- 1685Philadelphia County created Philadelphia boundaries were defined; Philadelphia was created in 1682, but no territorial limits were specified. · Pennsylvania Provincial Council, 1:73-74
- 1752Lost territory Philadelphia lost to the creation of Berks. · Pa. Stat., ch. 392, sec. 1/5:133-134
- 1784Lost territory Philadelphia lost to the creation of Montgomery. · Pa. Stat., ch. 1108, sec. 1/11:364
Land and parcels
What the maps cover in Philadelphia
Who publishes each layer, how good it is, and when we last checked.
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Parcels Good enough
Lot lines and tax-map numbers for 547,105 parcels. Drawn for tax purposes: usually within a few feet of a survey, but not a survey.
checked 14 October 2026 -
Address points Missing
No public address points layer found for Philadelphia County yet.
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Buildings Reference
Roof outlines traced from aerial imagery from FEMA Response Geospatial Office with Oak Ridge National Laboratory (ORNL). Good for seeing what is on a lot; not accurate enough to set a fence from.
checked 18 October 2026
- Official
- from the office that keeps the record
- Good enough
- a reliable statewide or national copy
- Fallback
- a guide only; check the official record
- Missing
- nothing public found yet
People and land
Philadelphia by the Census
Source: US Census Bureau, 2020 Census; US Census Bureau, 2020 Gazetteer Files. Not endorsed or certified by the Census Bureau.
See your own lot on these maps
Open Philadelphia County on Parcel Chart's free map and click your parcel. Save it with a free account; the full record of your place (site map, projects, documents) is Pro, in early access.
Questions
Common questions about Philadelphia County
- When was Philadelphia County founded?
- Philadelphia County was founded in 1682, and named after Philadelphia.
- What is the county seat of Philadelphia County?
- The county seat of Philadelphia County is Philadelphia.
- Is there an online parcel map for Philadelphia County?
- Yes. A public source publishes a parcel map of 547,105 parcels, rated good enough here. You can click any parcel on it in Parcel Chart's free map, no sign-in needed.
- Has Philadelphia County's boundary or name changed?
- Philadelphia County was created in 1682. Since then the Atlas of Historical County Boundaries records 3 later changes, chiefly involving Berks County and Montgomery County.
- Is my lot in a flood zone?
- We do not have flood maps for Philadelphia County yet. Look up the address on FEMA's Flood Map Service Center, which shows the effective flood map for any lot.
Nearby