Bergen County is the most populous county in the U.S. state of New Jersey. Located in the northeastern corner of New Jersey, Bergen County and its many inner suburbs constitute a highly developed part of the New York City metropolitan area, bordering the Hudson River; the George Washington Bridge, which crosses the Hudson, connects Bergen Co…Bergen County is the most populous county in the U.S. state of New Jersey. Located in the northeastern corner of New Jersey, Bergen County and its many inner suburbs constitute a highly developed part of the New York City metropolitan area, bordering the Hudson River; the George Washington Bridge, which crosses the Hudson, connects Bergen County with Manhattan. The county is part of the North Jersey region of the state.