Hellertown is a borough in Northampton County, Pennsylvania. Its population was 6,132 at the 2020 census. Hellertown is part of the Lehigh Valley metropolitan area, which had a population of 861,899 and was the 68th most populous metropolitan area in the U.S. as of 2020. The borough is home to Lost River Caverns, a natural limestone cavern. == Geography == Hellertown is located at 40°35′3″N 75°20′17″W (40.584099, -75.338139). According to the U.S. Census Bureau, the borough has a total area of 1.3 square miles (3.4 km2), all land. == Government and politics == === Legislators === State Representative Robert L. Freeman, Democrat, 136th district State Senator Lisa Boscola, Democrat, 18th district US Representative Susan Wild, Democrat, 7th district == Transportation == Pennsylvania Route 412 runs north-south through Hellertown on Main Street, heading north to Bethlehem and south into Bucks County, where it provides access to Pennsylvania Route 611. PA 412 has an interchange with Interstate 78 on the northern edge of Hellertown, which heads west to Allentown and Harrisburg and east to Easton and New York City.LANTA provides bus service to Hellertown along Route 215, which provides service Monday-Saturday north to Bethlehem and Lehigh Valley International Airport, and Route 105, which provides Sunday service north to Bethlehem and the Lehigh Valley Mall. Klein Transportation and Trans-Bridge Lines provide bus service from Hellertown to New York City from a park and ride lot located at the interchange between I-78 and PA 412. Hellertown formerly had commuter rail service along SEPTA's Bethlehem Line north to Bethlehem and south to Philadelphia at Hellertown station, but service ended in 1981.