County · code 42045
Delaware CountyPennsylvania
Delaware County is a county in Pennsylvania with its seat in Media, formed in 1789.
- Founded1789
- County seatMedia
- Named forDelaware River
- Land area184 sq mi + 6.8 sq mi water
- Population576,830 2020 Census
- Parcels mapped208,183 checked 16 October 2026
Where it is
Delaware 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
Formed in 1789 from Chester County
An old deed may name a county that no longer exists, or a boundary that has since moved.
Delaware County was created from Chester County on September 26, 1789, and was named after the Delaware River.
- 1789Delaware County created Delaware created from Chester. · Pa. Stat., ch. 1443, sec. 1/13:337-338
Land and parcels
What the maps cover in Delaware
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 208,183 parcels. Drawn for tax purposes: usually within a few feet of a survey, but not a survey.
checked 16 October 2026 -
Address points Missing
No public address points layer found for Delaware 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
Delaware by the Census
Source: US Census Bureau, 2020 Census; US Census Bureau, 2020 Gazetteer Files. Not endorsed or certified by the Census Bureau.
Rules and offices
Delaware County's official site
We have found the county's site but not its offices yet; start there.
County government
- County government
The official website of Delaware County.
See your own lot on these maps
Open Delaware 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 Delaware County
- When was Delaware County founded?
- Delaware County was founded in 1789, formed from Chester County, and named after Delaware River.
- What is the county seat of Delaware County?
- The county seat of Delaware County is Media.
- Is there an online parcel map for Delaware County?
- Yes. A public source publishes a parcel map of 208,183 parcels, rated good enough here. You can click any parcel on it in Parcel Chart's free map, no sign-in needed.
- Has Delaware County's boundary or name changed?
- Delaware County was created in 1789 from Chester County. The Atlas of Historical County Boundaries records no boundary change since.
- Is my lot in a flood zone?
- We do not have flood maps for Delaware County yet. Look up the address on FEMA's Flood Map Service Center, which shows the effective flood map for any lot.
Nearby