ZIP codes in LaPorte County
17 ZIPs touch LaPorte County, Indiana. The blue dashed line is the county border; orange ZIPs reach into it.
17
ZIP codes
8
cross the county line
131,307
people in these ZIPs
92
counties in IN
Most people
LaPorte County ZIP list
More counties in Indiana
- Jefferson County11
- Jennings County14
- Johnson County12
- Knox County12
- Kosciusko County22
- LaGrange County13
- Lake County33
- Lawrence County12
- Madison County21
- Marion County65
- Marshall County15
- Martin County7
Questions people actually ask
How many ZIP codes are in LaPorte County, Indiana?
17 ZIP codes reach into LaPorte County, including 2 PO Box or single-address ZIPs placed by the town they serve. 8 of them are only partly in the county and also cover a neighboring county.
Which ZIP code in LaPorte County has the most people?
46350 (La Porte) has about 44,763 residents, the most of any ZIP touching LaPorte County, in the Census Bureau’s ACS 2020–2024 estimates.
Can a ZIP code be in LaPorte County and another county?
Yes. ZIP codes follow mail routes, not county lines. Rows marked with a percentage show how much of that ZIP’s land is in LaPorte County. For one address, pin the exact spot on the ZIP finder to see its county.
Where does this list come from?
ZIP areas and their county overlaps come from the Census Bureau’s 2020 ZIP Code Tabulation Area to county relationship file. PO Box ZIPs have no area, so each is placed in the county of the ZIP area nearest the town it serves.
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Updated 2026-11-10 · Where the data comes from