Middlesex 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 1,465,396 people, with a population density of about 778.39 persons per square mile.
The county spans a total land area of 824.00 square miles (2,134.00 square kilometers). The administrative center and county seat is Cambridge, which often serves as a hub for local governance and services. The largest city within the county by population is Lowell.
Geographically, Middlesex County experiences varied elevations, with its highest point at Ashby 904 ft and its lowest point at Chelmsford 0 ft. The region operates in the UTC-5.