Oswego /ɒsˈwiːɡoʊ/ is a village in Kendall County, Illinois, United States. The village population, according to the 2010 census, is 30,355. Its population has more than doubled since the 2000 census count of 13,326. With that growth, Oswego is the largest municipality located completely within Kendall County.Oswego is known to some Chicago area residents for the town dragstrip, open from 1955 until 1979, where muscle cars were raced by drivers from all over the Midwest. The drag days are celebrated today even though the strip has been closed for decades.