County · Indiana · United States
Lake County ZIP codes
27 ZIP codes · 18 cities · FIPS 18089
Key facts
- State
- Indiana (IN)
- FIPS code
- 18089
- Population
- 498,990
- Median household income
- $68,985
- Median age
- 39.6
- Land area
- 498.7 sq mi (1,291.7 km²)
- Population density
- 1,001 / sq mi
- Area codes
- 219
Cities and ZIP codes in Lake County (18)
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.