Plum Valley, IL

Plum Valley is a suburban unincorporated community and CDP in northeastern Will County, with Cook County to the north and Lake County, Indiana, to the east. Willow Brook Estates lies to the south, and Plum Creek runs from southwest to northeast through the middle of the place. It was first listed as a CDP before the 2020 census, so the name describes a settled pocket rather than an incorporated town with its own hall.

The creek is the local thread. Will County land-use maps put Plum Valley in the county's eastern edge, where creek corridors, subdivisions, and county lines matter more than a central business strip. Because there is no separate municipal government, an address here is read through Will County and the surrounding service districts, with Cook County and Indiana just across the edges. The local scoop is a place named for a valley and creek, tucked into the Chicago-region fringe, where three county or state directions show up before any downtown does.