ZIP codes in Oldham County
12 ZIPs touch Oldham County, Kentucky. The blue dashed line is the county border; orange ZIPs reach into it.
12
ZIP codes
6
cross the county line
156,067
people in these ZIPs
120
counties in KY
Most people
Oldham County ZIP list
More counties in Kentucky
- Montgomery County5
- Morgan County11
- Muhlenberg County17
- Nelson County10
- Nicholas County6
- Ohio County17
- Owen County11
- Owsley County9
- Pendleton County10
- Perry County27
- Pike County44
- Powell County4
Questions people actually ask
How many ZIP codes are in Oldham County, Kentucky?
12 ZIP codes reach into Oldham County, including 1 PO Box or single-address ZIPs placed by the town they serve. 6 of them are only partly in the county and also cover a neighboring county.
Which ZIP code in Oldham County has the most people?
40245 (Louisville) has about 39,835 residents, the most of any ZIP touching Oldham County, in the Census Bureau’s ACS 2020–2024 estimates.
Can a ZIP code be in Oldham 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 Oldham 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