County · Illinois · United States
Cook County ZIP codes
164 ZIP codes · 93 cities · FIPS 17031
Key facts
- State
- Illinois (IL)
- FIPS code
- 17031
- Population
- 5,185,812
- Median household income
- $81,797
- Median age
- 37.8
- Land area
- 944.9 sq mi (2,447.4 km²)
- Population density
- 5,488 / sq mi
- Area codes
- 217, 224, 309, 312, 331, 447, 464, 618, 630, 708, 773, 779, 815, 847, 872
Cities and ZIP codes in Cook County (93)
About this page
County figures are Census county-level values (ACS 5-year); the ZIP list shows the ZIPs whose primary county this is — a ZIP on a border can also serve neighbouring counties.
Sources: U.S. Census Bureau (2020 county relationship file, ACS 5-year) · GeoNames. Methodology.