Fullerton is an unincorporated area and census-designated place (CDP) in Whitehall Township in Lehigh County, Pennsylvania.

[3] In 1895, the town was renamed "Fullerton" in honor of local businessman James W. Fuller Jr., who had purchased the railroad car wheel factory of Frederick & Company in 1865 and operated it as McKee, Fuller & Co.[4] and later the Lehigh Car, Wheel & Axle Works.

[5] Fuller laid out the hamlet in 1870, and by 1883 it was a thriving company town with a population in excess of 1,500 men and their families.

When the Lehigh Valley cement industry exploded in the early 1900s, Fuller's company prospered by providing machinery to the mills in the region, and the town supplied the workforce for both his factories, and the numerous mills and quarries operating in the immediate area.

The Dent Hardware Company Factory Complex in Fullerton was listed on the National Register of Historic Places in 1986.

[6] Fullerton is located in eastern Lehigh County at 40°37′53″N 75°28′49″W / 40.63139°N 75.48028°W / 40.63139; -75.48028 (40.631297, -75.480215),[7] in the southern part of Whitehall Township.

The Lehigh Valley Mall is located in Fullerton on the northeastern side of the US-22/PA-145 interchange.