New London County is a county located in the U.S. state of Connecticut. As of the most recent data available, the county has a population of approximately 259,088 people, with a population density of about 389.02 persons per square mile.
The county spans a total land area of 666.00 square miles (1,725.00 square kilometers). The administrative center and county seat is , which often serves as a hub for local governance and services. The largest city within the county by population is Norwich.
Geographically, New London County experiences varied elevations, with its highest point at Colchester 475 ft and its lowest point at East Lyme 0 ft. The region operates in the UTC-5.