Northumberland County is located in Pennsylvania, United States.
Northumberland 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 94,556 people, with a population density of about 205.56 persons per square mile.
The county spans a total land area of 460.00 square miles (1,191.00 square kilometers). The administrative center and county seat is Sunbury, which often serves as a hub for local governance and services. The largest city within the county by population is Sunbury.
Geographically, Northumberland County experiences varied elevations, with its highest point at Marion Heights 1,323 ft and its lowest point at Mount Carmel 0 ft. The region operates in the UTC-5.