Essex County is a county located in the U.S. state of Massachusetts. As of the most recent data available, the county has a population of approximately 723,419 people, with a population density of about 452.65 persons per square mile.
The county spans a total land area of 498.00 square miles (1,290.00 square kilometers). The administrative center and county seat is Salem, which often serves as a hub for local governance and services. The largest city within the county by population is Lynn.
Geographically, Essex County experiences varied elevations, with its highest point at Andover 180 ft and its lowest point at Newbury 0 ft. The region operates in the UTC-5.