Zip Codes for Cities and Towns in Northwest Indiana:
Lake County:
- Cedar Lake – 46303
- Crown Point – 46307, 46308
- Dyer – 46311, 46373
- East Chicago – 46312
- Gary – 46401, 46402, 46403, 46404, 46405, 46406, 46407, 46408, 46409
- Griffith – 46319
- Hammond – 46320, 46323, 46324, 46325, 46327,
- Highland – 46322, 47854
- Lake Station – 46405
- Lowell – 46356
- Merrillville – 46410, 46411
- Munster – 46321
- New Chicago – 46342
- Schererville – 46375
- Schneider – 46376
- St. John – 46373
- Whiting – 46394
- Winfield – 46307
Porter County:
- Beverly Shores – 46301
- Burns Harbor – 46304
- Chesterton – 46304
- Dune Acres – 46304
- Hebron – 46341
- Kouts – 46347
- Ogden Dunes – 46368
- Portage – 46368
- Porter – 46304
- Town of Pines –
- Valparaiso – 46383, 46384, 46385
Laporte County:
- Kingsbury – 46345
- Kingsford Heights – 46346
- La Crosse – 46348
- La Porte – 46350, 46352
- Long Beach – 46350
- Michiana Shores – 46360
- Michigan City – 46360, 46361
- Pottawattamie Park – 46360
- Trail Creek – 46360
- Wanatah – 46390
- Westville – 46391
Jasper County:
- DeMotte – 46310
- Fair Oaks – 47943
- Remington – 47977
- Rensselaer – 47978
- Roselawn – 46310, 46372
- Wheatfield – 46380, 46392,
Newton County:
- Brook – 47922
- Goodland – 47948
- Kentland – 47951
- Lake Village – 46349
- Morocco – 47963
- Mount Ayr – 47964
- Roselawn – 46372, 46310
