Simpson County, Kentucky ZIP codes
2 ZIP codes are in Simpson County, plus 4 that cross in from neighboring counties. It's part of the Franklin, KY micro area.
- ZIP codes
- 2
- Population in these ZIPs
- 19,380
- Avg. median income
- $59,100population-weighted
- Cities & towns
- 1
Click anywhere on the map to see which ZIP code it's in.
ZIP codes in Simpson County
| ZIP code | City | Population | Median income | Typical home value |
|---|---|---|---|---|
| 42134 | Franklin | 19,380 | $59,113 | $247,700 |
| 42135 PO Box | Franklin | — | — | — |
ZIP codes partly in Simpson County
These ZIP codes are mostly in a neighboring county but cover part of Simpson County.
| ZIP code | City | County | Population | Median income | Typical home value |
|---|---|---|---|---|---|
| 42104 | Bowling Green | Warren County | 42,076 | $75,164 | $320,500 |
| 42170 | Woodburn | Warren County | 1,938 | $96,111 | $286,200 |
| 42202 | Adairville | Logan County | 1,958 | $62,656 | $174,300 |
| 42206 | Auburn | Logan County | 5,897 | $66,815 | $236,200 |
Population and median household income: ACS 2020–2024 5-year estimates. Typical home value: Zillow Home Value Index (September 2026) where available, otherwise the ACS median owner-reported value. "PO Box" marks ZIP codes with no delivery area of their own. Methodology
Cities and towns in Simpson County
Nearby counties
Frequently asked questions
How many ZIP codes are in Simpson County, Kentucky?
2 ZIP codes are mainly in Simpson County, and 4 more ZIP codes from neighboring areas reach partly into it.
What cities are in Simpson County?
ZIP codes in Simpson County use the city names Franklin.
What metro area is Simpson County in?
Simpson County is part of the Franklin, KY micropolitan statistical area.