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Darien is a city in DuPage County, Illinois, a southwestern suburb of Chicago whose motto is "A Nice Place to Live."

The first settlers arrived from New England in 1835 along an old stagecoach line, and Thomas Andrus named the settlement "Cass" and ran an inn, tavern and post office serving stagecoach travelers.

Andrus helped build the log-cabin First Cass Church, which doubled as the community's first schoolhouse, and its cemetery can still be seen today.

The modern city grew out of the unincorporated communities of Cass and Lace and subdivisions such as Marion Hills, Brookhaven, Farmingdale and Hinsbrook.

Residents incorporated as a single city on December 13, 1969, as nearby Downers Grove began expanding southward into the area.

When the founders deadlocked on a name, acting mayor Sam Kelly suggested "Darien" after Darien, Connecticut, a community he had found pleasant and attractive - though Illinoisans pronounce the name with the accent on the first syllable.

The 2020 census counted 22,011 people in Darien, and Census QuickFacts count about 8,735 households for 2020-2024.

Darien covers about 9.5 square miles and has two Interstate 55 interchanges, at Cass Avenue and Lemont Road.

Hinsdale South High School, home of the Hornets, stands in Darien at 75th Street and Clarendon Hills Road and serves Darien students as part of Hinsdale Township High School District 86.

Hinsdale South also hosts the LaGrange Area Department of Special Education's regional Deaf and Hard of Hearing program.