ZIP codes in Macoupin County
29 ZIPs touch Macoupin County, Illinois. The blue dashed line is the county border; orange ZIPs reach into it.
29
ZIP codes
17
cross the county line
93,146
people in these ZIPs
102
counties in IL
Most people
Macoupin County ZIP list
More counties in Illinois
- Lake County40
- Lawrence County7
- Lee County24
- Livingston County29
- Logan County20
- Macon County29
- Madison County36
- Marion County15
- Marshall County19
- Mason County11
- Massac County8
- McDonough County17
Questions people actually ask
How many ZIP codes are in Macoupin County, Illinois?
29 ZIP codes reach into Macoupin 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 Macoupin County has the most people?
62002 (Alton) has about 29,543 residents, the most of any ZIP touching Macoupin County, in the Census Bureau’s ACS 2020–2024 estimates.
Can a ZIP code be in Macoupin 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 Macoupin 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