Boundaries: U.S. Census Bureau · Population: Vintage 2024 estimates

Illinois county map

Illinois has 102 counties. Color the ones you've lived in, visited, or passed through, then share your map or download it.

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Pick a category, then click counties. Click again with the same color to clear. Drag to pan, scroll or pinch to zoom.

Every category is yours to change: click its swatch to pick any color, click its name to rename it, and use + Add for up to eight.

Most populous: Cook County, 5,182,617. Least populous: Hardin County, 3,550.

Largest by land area: McLean County, 1,183 square miles.

Illinois borders Iowa, Indiana, Kentucky, Missouri, and Wisconsin.

Populations are Census Bureau estimates for July 1, 2024.

All 102 counties