ZIP codes in Cass County
13 ZIPs touch Cass County, Indiana. The blue dashed line is the county border; orange ZIPs reach into it.
13
ZIP codes
8
cross the county line
100,363
people in these ZIPs
92
counties in IN
Most people
Cass County ZIP list
More counties in Indiana
- Bartholomew County16
- Benton County11
- Blackford County7
- Boone County13
- Brown County10
- Carroll County20
- Clark County23
- Clay County18
- Clinton County12
- Crawford County10
- Daviess County7
- DeKalb County14
Questions people actually ask
How many ZIP codes are in Cass County, Indiana?
13 ZIP codes reach into Cass 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 Cass County has the most people?
46901 (Kokomo) has about 38,082 residents, the most of any ZIP touching Cass County, in the Census Bureau’s ACS 2020–2024 estimates.
Can a ZIP code be in Cass 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 Cass 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