Lehigh County does not zone. In Allentown (the county seat), residential fences in a required front setback max out at 4 feet, or 6 feet if the fence is open-style (picket, split-rail, wrought iron); 6 feet is allowed elsewhere on the lot.
Pennsylvania land use is municipal: under the PA Municipalities Planning Code (53 P.S. §10601) boroughs, townships, and cities zone, not counties. So fence height comes from your municipality. Allentown's Zoning Ordinance §660-45.B, in neighborhood (N) zones, caps front-setback fences at 4 feet, except open-ratio fences (1:1 solid-to-open or less, like picket or wrought iron) which may reach 6 feet. Fences outside the front setback (side and rear yards) may not exceed 6 feet. Other zones allow taller fences (up to 10 feet). Smaller boroughs (Emmaus, Macungie, Coopersburg) set their own limits, so confirm with your local zoning officer.
Zoning violations are enforced by the municipal zoning officer; a fence over 6 feet also needs a building permit, and building without one draws a $100 fine per Allentown's permit rules.
Other ordinances people look up for this city. Green dot = verified primary-source excerpt.
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See how Lehigh County's height limits rules stack up against other locations.
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