Trexlertown is an unincorporated community and census-designated place (CDP) in Upper Macungie Township in Lehigh County, Pennsylvania.

The global corporate headquarters of Air Products is located immediately across the Trexlertown's eastern border with Allentown.

Jeremiah Trexler obtained land adjoining that of his father in present-day Upper Macungie Township, where he operated a tavern as early as in 1732.

Two years later, in 1734, a road was developed from his Upper Macungie Township tavern south through North Wales to Philadelphia.

[5] Trexlertown is located southwest of the center of Lehigh County along the southeastern edge of Upper Macungie Township at an altitude of 397 feet (121 m).