THE ILLINOIS CITY LAND BRIEF
Land in the
River Hills setting.
Illinois City CDP has 0.46 square miles of land in Rock Island County. Its Census reference point is in River Hills, within Interior River Valleys and Hills.
Broad terraced river valleys contrast with wooded slopes and dissected glacial plains. Bottomland settings and upland oak landscapes occur close together across the Interior River Valleys and Hills.
Regional context: Interior River Valleys and Hills ↗ · Classification at the Census reference point
Illinois City and Rock Island County
Illinois City is associated with Rock Island County in the Census boundary data. Start with the parcel’s tax bill to match the property to that jurisdiction, then confirm which government handles its land use.
Illinois City by land and water
The Census records 0 square miles of water within Illinois City, or 0% of its total area. It is 5.3 percentage points lower than the 5.3% recorded for Rock Island County. This is geographic context; waterfront status and usable land must be checked at the parcel.
For scale, Illinois City CDP has 1% of the land area of nearby Buffalo Prairie township (46.1 square miles). These areas describe boundaries, not comparable property prices.

