County ZIP codes · Indiana · FIPS 18127
Porter County, IN ZIP Codes
Porter County, Indiana has 16 ZIP codes (Census 2020 ZCTA-county file; GeoNames postal codes, October 2026): 15 residential and 1 for PO boxes or a single organization. 9 of the residential ones lie mainly in Porter County and 6 mainly in a neighboring county; 7 cross the county line. Median household income ranges from $45,991 in 46403 (Gary) to $107,800 in 46307 (Crown Point) (Census Bureau, ACS 2020-2024).
- ACS2020-24
- Census2020
Where are the ZIP codes of Porter County?
Source: U.S. Census Bureau, 2020 ZCTA cartographic boundaries; ACS 2020-2024 5-year estimates (B19013).
How different are its ZIP codes?
The middle half of its ranked ZIP codes (1,000+ people living in households) report median household incomes between $64,375 and $91,326.
They carry 14 postal town names.
Source: U.S. Census Bureau, ACS 2020-2024 5-year estimates (B19013).
All 15 residential ZIP codes in Porter County
9 ZIP codes lie mainly in Porter County; 6 more reach into it from a neighboring county and follow the first table.
| In this county | ||||||
|---|---|---|---|---|---|---|
| 46383 | Valparaiso | 42,183 | 482 | $76k | $280k | 100% |
| 46385 | Valparaiso | 40,856 | 506 | $99k | $332k | 100% |
| 46368 | Portage | 40,301 | 1,589 | $76k | $227k | 100% |
| 46304 | Chesterton | 28,307 | 490 | $91k | $293k | 100% |
| 46341 | Hebron | 10,048 | 105 | $90k | $269k | 50% |
| 46347 | Kouts | 4,951 | 69 | $95k | $255k | 100% |
| 46301 | Beverly Shores | 650 | 148 | $120k | $607k | 100% |
| 46393 | Wheeler | 216 | 126 | $56k | $144k | 100% |
| 46302 | Boone Grove | 29 | 16 | $57k | $305k | 100% |
Partly in Porter County
| In this county | ||||||
|---|---|---|---|---|---|---|
| 46391 | Westville | 8,986 | 226 | $83k | $254k | 33% |
| 46342 | Hobart | 32,224 | 920 | $76k | $213k | 28% |
| 46360 | Michigan City | 43,817 | 572 | $59k | $167k | 16% |
| 46403 | Gary | 10,929 | 1,183 | $46k | $178k | 10% |
| 46307 | Crown Point | 71,673 | 822 | $108k | $324k | 3% |
| 46348 | La Crosse | 1,217 | 24 | $64k | $169k | 1% |
Source: U.S. Census Bureau, ACS 2020-2024 5-year estimates; county shares by land area (Census 2020 ZCTA-county relationship file).
Which ZIP codes cross the county line?
7 ZIP codes of Porter County extend into another county. A ZIP code follows mail routes, not county borders.
| ZIP | In Porter | Elsewhere |
|---|---|---|
| 46307 | 3% | Lake County 97% |
| 46360 | 16% | LaPorte County 84% |
| 46342 | 28% | Lake County 72% |
| 46403 | 10% | Lake County 90% |
| 46341 | 50% | Lake County 49%; Jasper County 1% |
| 46391 | 33% | LaPorte County 67% |
| 46348 | 1% | LaPorte County 99% |
Source: U.S. Census Bureau, 2020 ZCTA-county relationship file (shares of land area).
PO Box and single-organization ZIP codes
| ZIP | Postal name |
|---|---|
| 46384 | Valparaiso |
Source: GeoNames postal codes (CC BY 4.0).
Which first three digits do Porter County's ZIP codes use?
The first three digits of a ZIP code name the sectional center, the mail processing plant that sorts it. Porter County's ZIP codes use 2 prefixes: 463 and 464.
Source: U.S. Postal Service, labeling list L005 (3-digit ZIP Code prefix groups, SCF sortation), effective October 1, 2026.