Suffolk 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 689,807 people, with a population density of about 691.64 persons per square mile.
The county spans a total land area of 59.00 square miles (153.00 square kilometers). The administrative center and county seat is Boston, which often serves as a hub for local governance and services. The largest city within the county by population is Boston.
Geographically, Suffolk County experiences varied elevations, with its highest point at Winthrop 36 ft and its lowest point at Chelsea 10 ft. The region operates in the UTC-5.