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Oswego is a village on the Fox River in Kendall County, Illinois, roughly 50 miles from Chicago's Loop, and it was incorporated before the Civil War.

Oswego is the largest municipality in Kendall County, with a 2020 census population of 34,585 — and Census Bureau estimates already put it near 39,948 by July 2025.

Census Bureau figures count about 12,243 households in Oswego.

Few American towns have grown like Oswego — it had just 3,876 residents in 1990, then rocketed to 13,326 in 2000 and 30,355 in 2010 as Chicago's suburbs swept southwest.

Oswego anchors Kendall County, which more than doubled in population after 2000 and was the fastest-growing county in the entire United States between 2000 and 2010.

The village straddles the Kendall and Will county line, with most of its land and people in Kendall County.

Oswego's history is preserved at the Little White School Museum, a restored 1850s schoolhouse that now serves as the community's history museum and archive.

The Fox River Trail runs through Oswego along the river, making the village a popular stop for cyclists, kayakers, and canoeists.

Students attend Oswego Community Unit School District 308, whose two high schools — Oswego High School and Oswego East High School — face off in a football rivalry known as the Crosstown Classic.

Oswego High School traces its roots back to 1867, and in 2005 the combined marching bands of Oswego and Oswego East were the only band from Illinois to march in the Tournament of Roses Parade.