Layfield, Pennsylvania is an unincorporated community in NW Montgomery County on Route 73 and Route 663.
PA 663 begins at an intersection with PA 100 in Pottstown, Montgomery County, heading east on four-lane undivided West King Street.
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The route becomes undivided and comes to an interchange with I-476 (Pennsylvania Turnpike Northeast Extension).
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Its northern terminus is at PA 309 and PA 313 in Quakertown, where it continues eastward as PA 313, and its southern terminus is at PA 100 in Pottstown.
The Green Lane Reservoir is formed by a dam on the creek on the north side of Green Lane that backs up water from there to the north of Route 663.
Sassamansville, Pennsylvania is an unincorporated community in NW Montgomery County on Hoffmansville Road approximately 1 1/2 miles NW of Route 663.
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Its villages include Fagleysville, Frederick (also in Upper Frederick Township,) Hoffmansville, Layfield, New Hanover, New Hanover Square, and Sassamansville (also in Douglass Township.) Its numbered routes are 73 east-to-west and 663 north-to-south, which join briefly in Layfield.