ZIP codes in Eaton County
20 ZIPs touch Eaton County, Michigan. The blue dashed line is the county border; orange ZIPs reach into it.
20
ZIP codes
17
cross the county line
221,440
people in these ZIPs
83
counties in MI
Most people
Eaton County ZIP list
More counties in Michigan
- Chippewa County20
- Clare County8
- Clinton County17
- Crawford County6
- Delta County13
- Dickinson County11
- Emmet County13
- Genesee County45
- Gladwin County7
- Gogebic County6
- Grand Traverse County13
- Gratiot County23
Questions people actually ask
How many ZIP codes are in Eaton County, Michigan?
20 ZIP codes reach into Eaton County, including 1 PO Box or single-address ZIPs placed by the town they serve. 17 of them are only partly in the county and also cover a neighboring county.
Which ZIP code in Eaton County has the most people?
48911 (Lansing) has about 39,876 residents, the most of any ZIP touching Eaton County, in the Census Bureau’s ACS 2020–2024 estimates.
Can a ZIP code be in Eaton 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 Eaton 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.
Keep exploring
Updated 2026-11-10 · Where the data comes from