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Cameron is an unincorporated census-designated place in Warren County, Illinois — the Census Bureau counted just 188 residents there in 2020, spread over about 0.6 square miles.

Cameron began as two separate railroad plats: Cameronville, surveyed on February 22, 1854, by County Surveyor J. W. Adcock and named for landowner Robert Cameron, and a second plat called Cameron laid out a little later on the north side of the tracks in Coldbrook Township.

Although the two plats grew into a single community, old Warren County histories note that Cameronville and Cameron long kept their separate names on county records and in real-estate deals.

The village's business district developed on the Floyd Township side of the line, while its school stood on the Coldbrook Township side in a union district — the community literally straddles two townships.

Cameron had about 330 residents in 1900, when its stores, elevator company and railroad stop made it a busy farm shipping point.

The 2020 census recorded 79 households in Cameron, and about 94% of its occupied homes were owner-occupied — one of the highest home-ownership shares anywhere.

Cameron is an older community by Illinois standards, with a median age of 49.0 years in 2020 and about a quarter of its residents aged 65 or older.