Armstrong 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 72,392 people, with a population density of about 110.69 persons per square mile.
The county spans a total land area of 654.00 square miles (1,694.00 square kilometers). The administrative center and county seat is Kittanning, which often serves as a hub for local governance and services. The largest city within the county by population is Kittanning.
Geographically, Armstrong County experiences varied elevations, with its highest point at Elderton 1,264 ft and its lowest point at Freeport 0 ft. The region operates in the UTC-5.