ZIP codes in Harris County
238 ZIPs touch Harris County, Texas. The blue dashed line is the county border; orange ZIPs reach into it.
238
ZIP codes
22
cross the county line
5,369,225
people in these ZIPs
254
counties in TX
Most people
Harris County ZIP list
More counties in Texas
- Hale County10
- Hall County7
- Hamilton County10
- Hansford County3
- Hardeman County2
- Hardin County12
- Harrison County16
- Hartley County4
- Haskell County11
- Hays County15
- Hemphill County4
- Henderson County17
Questions people actually ask
How many ZIP codes are in Harris County, Texas?
238 ZIP codes reach into Harris County, including 95 PO Box or single-address ZIPs placed by the town they serve. 22 of them are only partly in the county and also cover a neighboring county.
Which ZIP code in Harris County has the most people?
77494 (Katy) has about 140,157 residents, the most of any ZIP touching Harris County, in the Census Bureau’s ACS 2020–2024 estimates.
Can a ZIP code be in Harris 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 Harris 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