County · code 42077
Lehigh CountyPennsylvania
Lehigh County is in Pennsylvania with its seat in Allentown. It was formed on March 6, 1812 from Northampton County and named after the Lehigh River.
- Founded1812
- County seatAllentown
- Named forLehigh River
- Land area345 sq mi + 2.9 sq mi water
- Population374,557 2020 Census
- Parcels mapped127,033 checked 16 October 2026
Where it is
Lehigh 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 1812 from Northampton County
An old deed may name a county that no longer exists, or a boundary that has since moved.
Lehigh County was created from Northampton County in 1812.
- 1812Lehigh County created Lehigh created from Northampton. · Pa. Laws 1811-1812, ch. 49, sec. 1/p. 76
Land and parcels
What the maps cover in Lehigh
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 127,033 parcels. Drawn for tax purposes: usually within a few feet of a survey, but not a survey.
edited 5 October 2026 · checked 16 October 2026 -
Address points Missing
No public address points layer found for Lehigh 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
Lehigh 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
Lehigh 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 Lehigh County.
See your own lot on these maps
Open Lehigh 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 Lehigh County
- When was Lehigh County founded?
- Lehigh County was founded in 1812, formed from Northampton County, and named after Lehigh River.
- What is the county seat of Lehigh County?
- The county seat of Lehigh County is Allentown.
- Is there an online parcel map for Lehigh County?
- Yes. A public source publishes a parcel map of 127,033 parcels, rated good enough here. You can click any parcel on it in Parcel Chart's free map, no sign-in needed.
- Has Lehigh County's boundary or name changed?
- Lehigh County was created in 1812 from Northampton 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 Lehigh County yet. Look up the address on FEMA's Flood Map Service Center, which shows the effective flood map for any lot.
Nearby