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is a city that lies on the borders of DeKalb County, Illinois, LaSalle County, Illinois and Kendall County, Illinois. The population was 6,509 at the 2000 census. Sandwich is the home of the Sandwich Fair. Held yearly the Wednesday-Sunday after Labor Day since 1888, it is the oldest continuing county fair in the state of Illinois and is one of the largest antique fairs in the United States, drawing daily crowds of more than 100,000, with the top attendance days reaching more than 200,000 fair-goers.
According to the United States Census Bureau, the city has a total area of 3.0 square miles (7.8 km²), all of it land.