Warren is a city in Warren County , Pennsylvania , United States . The population was 10,259 at the 2000 census. It is the county seat of Warren County GR6 . Warren is home to the headquarters of the Allegheny National Forest , Northwest Savings Bank, Pennsylvania General Energy, and Blair Corporation, a large mail order business. Located nearby in North Warren is Warren State Hospital, a mental care facility, Warren/Forest Higher Education Council, the college and university center in Warren, as well as the office of the Cornplanter State Forest . Warren county was recently named the second best rural county in America by Progressive Farmer magazine. Unfortunately, Warren continues to be plagued by high local income and property taxes. Although in recent years Warren has struggled through some hard times, the city is once again bouncing back with the Impact Warren project, a riverfront development project in downtown Warren. This project, when completed, will include, among others, new townhouses and senior citizen housing, new retail and commercial development, a parking garage, convention center, and TAWC bus depot. This, coupled with the new Wal-Mart complex in nearby North Warren, will help the city and region recapture some of its old glory. Also in Warren is the home of United Refining Company who supplies Kwik Fill and Red Apple Food Mart gas stations. Additionally, Pellegrino Food Products , a nationwide manufacturer and supplier of frozen Italian foods, has its headquarters and plant in Warren.