ZIP codes in Macon County
29 ZIPs touch Macon County, Illinois. The blue dashed line is the county border; orange ZIPs reach into it.
29
ZIP codes
13
cross the county line
114,885
people in these ZIPs
102
counties in IL
Most people
Macon County ZIP list
More counties in Illinois
- LaSalle County29
- Lake County40
- Lawrence County7
- Lee County24
- Livingston County29
- Logan County20
- Macoupin County29
- Madison County36
- Marion County15
- Marshall County19
- Mason County11
- Massac County8
Questions people actually ask
How many ZIP codes are in Macon County, Illinois?
29 ZIP codes reach into Macon County, including 2 PO Box or single-address ZIPs placed by the town they serve. 13 of them are only partly in the county and also cover a neighboring county.
Which ZIP code in Macon County has the most people?
62521 (Decatur) has about 32,665 residents, the most of any ZIP touching Macon County, in the Census Bureau’s ACS 2020–2024 estimates.
Can a ZIP code be in Macon 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 Macon 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