Question: Interstate 80 runs from San Francisco, California to which county of New Jersey?
Related documents: [0]  [DOC] Interstate 80 (I-80) is a part of the Interstate Highway System that runs from San Francisco, California, to Teaneck, New Jersey. I-80 enters Illinois from Iowa in the west, southwest of Rapids City and runs generally eastward through East Moline, LaSalle and Joliet, before entering Indiana in Lansing. The interstate runs for approximately 163.41 mi through the state. [END] 
[1]  [DOC] Teaneck is a township in Bergen County, New Jersey, United States, and a suburb in the New York metropolitan area. As of the 2010 United States Census, the township's population was 39,776, reflecting an increase of 516 (+1.3%) from the 39,260 counted in the 2000 Census, which had in turn increased by 1,435 (+3.8%) from the 37,825 counted in the 1990 Census. As of 2010 it was the second-most populous among the 70 municipalities in Bergen County, behind Hackensack, which had a population of 43,010. [END] 
Answer: 
Bergen County
Bergen County