According to the United States Census Bureau, the village has a total area of 6.7 square miles (17km2), of which, 6.6 square miles (17km2) of it is land and 0.1 square miles (0.26km2) of it (1.50%) is water. Oswego is a village in Kendall County, Illinois, United States. As of the 2010 census, the village population was 30,355. Its population has more than doubled since the 2000 census count of 13,326. Oswego is the largest municipality located completely within Kendall County.