Lehigh County, PA zoning map, flood zone and property lines by address
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Towns in Lehigh County: Allentown, Whitehall Township, Fullerton.
Flood zone by address
ParcelSheet reads FEMA's National Flood Hazard Layer at the lot: the zone, whether it is a high risk area where lenders ask for flood insurance, and the base flood elevation where FEMA lists one. FEMA's countywide study for Lehigh County has 88 FIRM panels, the newest effective July 2004; no coastal V zones are mapped in it.
The official panel and any Letter of Map Amendment are at FEMA's Map Service Center. An elevation certificate for a Lehigh house comes from a licensed surveyor and is often on file with the county or city building office.
Property lines
The parcel outline, parcel number and mapped size come from the Pennsylvania county parcel layers (each county publishes its own), so a Lehigh lot shows the same lines the county assessment office draws. Lehigh County covers about 221,015 acres of land and 1,841 acres of water.
Mapped lines are approximate. The Lehigh County assessment office keeps the parcel record (Lehigh County website); a licensed surveyor sets the true corners.
Zoning
In Pennsylvania zoning is set by the township, borough or city, or the county where the municipality has no zoning of its own: in Lehigh County, Allentown zones the land inside its limits. ParcelSheet shows the use code on the lot's parcel record and the municipality it sits in; the township or borough zoning office has the district, the uses it allows and the lot size it needs. The Lehigh County website lists the county's municipalities.
ADU and guest houses
Under Pennsylvania Municipalities Planning Code (Act 247 of 1968, 53 P.S. 10101 and following), the township, borough or city, or the county where the municipality has no zoning of its own can allow an accessory dwelling unit on a lot with a house. Whether a Lehigh lot can add one depends on its district; the township or borough zoning office has the rule. ParcelSheet shows the mapped lot size and the ground's slope, the first two things the question turns on.
Septic and soil
ParcelSheet reads the USDA soil survey at the lot: the soil's name, its septic absorption rating and whether it is prime farmland. Lehigh County is soil survey area PA077, Lehigh County, Pennsylvania, last updated September 2026, on Web Soil Survey.
A new or changed septic system in Lehigh County needs a permit from the local agency's sewage enforcement officer (the township, borough, joint agency or county health department, under Pennsylvania DEP Act 537 rules).
Setbacks
Setbacks in Lehigh County come from the zoning district: the front, side and rear distances a house must keep. ParcelSheet does not draw setback lines; the township or borough zoning office gives them for the lot's district, and Allentown for land inside its limits.
Hazards that apply
- Wetlands and wildfire. ParcelSheet shows the National Wetlands Inventory near a Lehigh lot and the Forest Service wildfire hazard rating at it.
Questions
Is my house in a flood zone in Lehigh County?
Type the address in the box above and ParcelSheet reads FEMA's flood zone at the lot's center. FEMA's countywide flood map for Lehigh County has 88 panels, the newest effective July 2004. A lender or insurer uses the official FIRM panel; FEMA's Map Service Center has it.
How do I find property lines in Lehigh County?
Open the Pennsylvania map, type the address, and the parcel outline from the Lehigh County assessment office shows on the map with its parcel number and mapped size. Mapped lines are approximate; only a licensed surveyor sets the true corners.
What is my property zoned in Lehigh County?
Zoning in Lehigh County is set by the township, borough or city, or the county where the municipality has no zoning of its own (such as Allentown). ParcelSheet shows the use code on the parcel record and names the municipality; the township or borough zoning office has the final word.
Can I build an ADU in Lehigh County?
Under Pennsylvania Municipalities Planning Code (Act 247 of 1968, 53 P.S. 10101 and following), the township, borough or city, or the county where the municipality has no zoning of its own can allow an accessory dwelling unit, and each sets its own rules. In Lehigh County ask the township or borough zoning office for the lot's district first; ParcelSheet shows the lot size as mapped so you can see the room you have.
Do I need a septic permit in Lehigh County?
Yes. A new or changed septic system in Lehigh County needs a permit from the local agency's sewage enforcement officer (the township, borough, joint agency or county health department, under Pennsylvania DEP Act 537 rules). ParcelSheet shows the USDA soil survey's septic rating at the lot, from survey area PA077 (Lehigh County, Pennsylvania).
What can I build on 5 acres in Lehigh County?
Zoning in Lehigh County is set by the township, borough or city, or the county where the municipality has no zoning of its own (such as Allentown). The zoning district decides the uses, how many homes and the smallest lot it allows on 5 acres. ParcelSheet shows the lot size as mapped and the use code on the parcel record; the township or borough zoning office has the district and its rules. See the Lehigh County website.
What are the residential setbacks in Lehigh County (2026)?
Setbacks in Lehigh County come from the zoning code of the municipality the lot sits in: the front, side and rear distances depend on the lot's district. ParcelSheet does not draw setback lines or give a number it did not read; the township or borough zoning office gives them for the district. See the Lehigh County website.
Next to Lehigh County: Bucks County, Carbon County, Montgomery County, Northampton County, Schuylkill County.
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