ZIP codes in Simpson County
6 ZIPs touch Simpson County, Kentucky. The blue dashed line is the county border; orange ZIPs reach into it.
6
ZIP codes
5
cross the county line
71,249
people in these ZIPs
120
counties in KY
Most people
Simpson County ZIP list
More counties in Kentucky
- Robertson County7
- Rockcastle County9
- Rowan County5
- Russell County7
- Scott County6
- Shelby County15
- Spencer County8
- Taylor County7
- Todd County10
- Trigg County5
- Trimble County5
- Union County6
Questions people actually ask
How many ZIP codes are in Simpson County, Kentucky?
6 ZIP codes reach into Simpson County, including 1 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 Simpson County has the most people?
42104 (Bowling Green) has about 42,076 residents, the most of any ZIP touching Simpson County, in the Census Bureau’s ACS 2020–2024 estimates.
Can a ZIP code be in Simpson 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 Simpson 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