ZIP codes in Harrison County
18 ZIPs touch Harrison County, Mississippi. The blue dashed line is the county border; orange ZIPs reach into it.
18
ZIP codes
5
cross the county line
253,420
people in these ZIPs
82
counties in MS
Most people
Harrison County ZIP list
More counties in Mississippi
- Forrest County10
- Franklin County8
- George County3
- Greene County7
- Grenada County10
- Hancock County14
- Hinds County38
- Holmes County9
- Humphreys County8
- Issaquena County6
- Itawamba County10
- Jackson County16
Questions people actually ask
How many ZIP codes are in Harrison County, Mississippi?
18 ZIP codes reach into Harrison County, including 5 PO Box or single-address ZIPs placed by the town they serve. 5 of them are only partly in the county and also cover a neighboring county.
Which ZIP code in Harrison County has the most people?
39503 (Gulfport) has about 55,059 residents, the most of any ZIP touching Harrison County, in the Census Bureau’s ACS 2020–2024 estimates.
Can a ZIP code be in Harrison 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 Harrison 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