Lake County, Indiana
Lake County is a county in Indiana. Its county FIPS code is 18089. Use the boundary map and neighboring areas below to check the jurisdiction you need.
- Official code
- 18089
- Representative coordinates
- 41.472247, -87.374337
- County type
- County
- County seat or government
- Crown Point
- Resident population, July 2025
- 504,612
- Land area
- 1,292.105 km²
- Water area
- 330.843 km²
- State
- Indiana
The representative point identifies this area. It is not a street address or a boundary survey.
Time zones in Lake County
| Time zone | Local time and UTC offset | Next clock change |
|---|---|---|
| America/Chicago | UTC-06:00 in January; UTC-05:00 in July. Enable JavaScript for the live clock. | Enable JavaScript for upcoming changes. |
Listed zones overlap the mapped area. A point lookup can distinguish sides of a boundary. Your device’s zone may differ.
Census ZIP areas
46303 · 46307 · 46311 · 46312 · 46319 · 46320 · 46321 · 46322 · 46323 · 46324 · 46327 · 46341 · 46342 · 46356 · 46373 · 46375 · 46376 · 46377 · 46394 · 46402 · 46403 · 46404 · 46405 · 46406 · 46407 · 46408 · 46409 · 46410
These statistical areas overlap the boundary. They are not delivery assignments; confirm mailing details with USPS ZIP Code Lookup.
Official county information
Use the US government local-office directory ↗ to find the office responsible for your address. A county website has not been confidently matched here. A geographic lookup cannot determine eligibility, tax liability or a court obligation.
Cities, towns and communities
These areas overlap the mapped boundary; an overlap does not mean that every address belongs to both.
- Cedar Lake town, IN
- Crown Point city, IN
- Dyer town, IN
- East Chicago city, IN
- Gary city, IN
- Griffith town, IN
- Hammond city, IN
- Highland town, IN
- Hobart city, IN
- Lake Dalecarlia CDP, IN
- Lakes of the Four Seasons CDP, IN
- Lake Station city, IN
- Leroy CDP, IN
- Lowell town, IN
- Merrillville town, IN
- Munster town, IN
- New Chicago town, IN
- Ross CDP, IN
- St. John town, IN
- Schererville town, IN
- Schneider town, IN
- Shelby CDP, IN
- Whiting city, IN
- Winfield town, IN
Areas sharing the mapped boundary
These areas touch this mapped boundary.
Before using this answer on a form
Use a precise point for address-level questions. A device accuracy circle can cross a boundary; confirm tax, voting or jury details with the responsible office.
Find the county at your current point, check its ZIP area, or find its physical time zone.