County · Illinois · United States
Lake County ZIP codes
29 ZIP codes · 28 cities · FIPS 17097
Key facts
- State
- Illinois (IL)
- FIPS code
- 17097
- Population
- 711,885
- Median household income
- $108,917
- Median age
- 38.9
- Land area
- 443.6 sq mi (1,149 km²)
- Population density
- 1,605 / sq mi
- Area codes
- 217, 224, 447, 847
Cities and ZIP codes in Lake County (28)
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.