Lehigh County is a county located in the U.S. state of Pennsylvania. As of the most recent data available, the county has a population of approximately 312,090 people, with a population density of about 899.39 persons per square mile.
The county spans a total land area of 347.00 square miles (899.00 square kilometers). The administrative center and county seat is Allentown, which often serves as a hub for local governance and services. The largest city within the county by population is Allentown.
Geographically, Lehigh County experiences varied elevations, with its highest point at Schnecksville 666 ft and its lowest point at Allentown 350 ft. The region operates in the UTC-5.