Lake County, Indiana ZIP codes
32 ZIP codes are in Lake County, plus 1 that cross in from neighboring counties. It's part of the Chicago-Naperville-Elgin, IL-IN metro area.
- ZIP codes
- 32
- Population in these ZIPs
- 504,725
- Avg. median income
- $76,200population-weighted
- Cities & towns
- 19
Click anywhere on the map to see which ZIP code it's in.
ZIP codes in Lake County
| ZIP code | City | Population | Median income | Typical home value |
|---|---|---|---|---|
| 46303 | Cedar Lake | 17,680 | $84,211 | $336,100 |
| 46307 | Crown Point | 71,673 | $107,800 | $360,200 |
| 46308 PO Box | Crown Point | — | — | — |
| 46311 | Dyer | 23,321 | $116,652 | $366,100 |
| 46312 | East Chicago | 26,022 | $42,125 | $129,600 |
| 46319 | Griffith | 17,847 | $74,662 | $250,800 |
| 46320 | Hammond | 14,353 | $37,158 | $144,700 |
| 46321 | Munster | 23,733 | $110,187 | $353,700 |
| 46322 | Highland | 23,680 | $78,062 | $268,000 |
| 46323 | Hammond | 23,047 | $59,688 | $187,800 |
| 46324 | Hammond | 21,409 | $63,052 | $184,100 |
| 46325 PO Box | Hammond | — | — | — |
| 46327 | Hammond | 10,597 | $47,288 | $156,200 |
| 46342 | Hobart | 32,224 | $75,521 | $239,100 |
| 46355 PO Box | Leroy | — | — | — |
| 46356 | Lowell | 19,721 | $89,217 | $334,900 |
| 46373 | Saint John | 18,843 | $127,146 | $458,400 |
| 46375 | Schererville | 24,188 | $93,160 | $358,000 |
| 46376 | Schneider | 319 | $64,205 | $179,400 |
| 46377 | Shelby | 45 | $38,958 | $177,700 |
| 46394 | Whiting | 11,894 | $66,176 | $205,700 |
| 46401 PO Box | Gary | — | — | — |
| 46402 | Gary | 5,836 | $33,529 | $61,300 |
| 46403 | Gary | 10,929 | $45,991 | $149,800 |
| 46404 | Gary | 15,428 | $42,256 | $97,600 |
| 46405 | Lake Station | 12,184 | $60,881 | $158,500 |
| 46406 | Gary | 9,001 | $35,839 | $77,300 |
| 46407 | Gary | 8,577 | $28,526 | $57,400 |
| 46408 | Gary | 15,747 | $47,453 | $107,600 |
| 46409 | Gary | 7,184 | $44,667 | $74,500 |
| 46410 | Merrillville | 39,243 | $64,127 | $242,200 |
| 46411 PO Box | Merrillville | — | — | — |
ZIP codes partly in Lake County
These ZIP codes are mostly in a neighboring county but cover part of Lake County.
| ZIP code | City | County | Population | Median income | Typical home value |
|---|---|---|---|---|---|
| 46341 | Hebron | Porter County | 10,048 | $89,559 | $328,100 |
Population and median household income: ACS 2020–2024 5-year estimates. Typical home value: Zillow Home Value Index (September 2026) where available, otherwise the ACS median owner-reported value. "PO Box" marks ZIP codes with no delivery area of their own. Methodology
Cities and towns in Lake County
Nearby counties
Frequently asked questions
How many ZIP codes are in Lake County, Indiana?
32 ZIP codes are mainly in Lake County, and 1 more ZIP codes from neighboring areas reach partly into it.
What cities are in Lake County?
ZIP codes in Lake County use the city names Cedar Lake, Crown Point, Dyer, East Chicago, Gary, Griffith, Hammond, Highland, Hobart, Lake Station, Leroy and Lowell and others.
What metro area is Lake County in?
Lake County is part of the Chicago-Naperville-Elgin, IL-IN metropolitan statistical area.