ZIP codes in Jefferson County
102 ZIPs touch Jefferson County, Alabama. The blue dashed line is the county border; orange ZIPs reach into it.
102
ZIP codes
20
cross the county line
826,550
people in these ZIPs
67
counties in AL
Most people
Jefferson County ZIP list
More counties in Alabama
- Geneva County15
- Greene County10
- Hale County9
- Henry County9
- Houston County16
- Jackson County22
- Lamar County9
- Lauderdale County12
- Lawrence County10
- Lee County19
- Limestone County16
- Lowndes County8
Questions people actually ask
How many ZIP codes are in Jefferson County, Alabama?
102 ZIP codes reach into Jefferson County, including 38 PO Box or single-address ZIPs placed by the town they serve. 20 of them are only partly in the county and also cover a neighboring county.
Which ZIP code in Jefferson County has the most people?
35242 (Birmingham) has about 57,374 residents, the most of any ZIP touching Jefferson County, in the Census Bureau’s ACS 2020–2024 estimates.
Can a ZIP code be in Jefferson 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 Jefferson 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