ZIP codes in Porter County
17 ZIPs touch Porter County, Indiana. The blue dashed line is the county border; orange ZIPs reach into it.
17
ZIP codes
8
cross the county line
338,941
people in these ZIPs
92
counties in IN
Most people
Porter County ZIP list
More counties in Indiana
- Ohio County5
- Orange County11
- Owen County14
- Parke County14
- Perry County14
- Pike County11
- Posey County7
- Pulaski County13
- Putnam County16
- Randolph County14
- Ripley County15
- Rush County16
Questions people actually ask
How many ZIP codes are in Porter County, Indiana?
17 ZIP codes reach into Porter County, including 1 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 Porter County has the most people?
46307 (Crown Point) has about 71,673 residents, the most of any ZIP touching Porter County, in the Census Bureau’s ACS 2020–2024 estimates.
Can a ZIP code be in Porter 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 Porter 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