ZIP CodesZIP codes in Lake County, Indiana
Lake County, Indiana has 32 ZIP codes in this list, from 46303 to 46411. They cover 19 places, among them Gary, Hammond, Crown Point and Merrillville.
Nothing in this county matches.
The ZIP code areas of Lake County add up to about 465 square miles of land (1,205 sq km) as the Census Bureau draws them. The largest is 46356 (Lowell), with 113 square miles.
Places with more than one code here: Gary (8 codes), Hammond (5 codes), Crown Point (2 codes).
Using these codes
- In an address, the ZIP code comes last, after the city and the two-letter state: Cedar Lake, IN 46303.
- Tap a ZIP code to open it in the look-up, with a copy button for the address line.
- A code can cross a county line, and one town can have several codes. The table shows the main place of each code.
- "No area" means the Census Bureau draws no area for that code. Such codes are usually for post office boxes or a single building.
Places and counties: GeoNames. Areas: U.S. Census Bureau, 2024 ZIP Code Tabulation Areas. Checked in November 2026. This site is not connected with the United States Postal Service; for mailing, confirm the address with USPS.