Simpson County ZIP Codes
Simpson County is a county of Kentucky.
- ZIP codes
- 2
- Cities & towns
- 1
- Area codes
- 2
- Land area
- 234 sq mi
Every ZIP code in Simpson County
| ZIP code | City |
|---|---|
| 42134 | Franklin |
| 42135 | Franklin |
We do not publish a delivery type (standard, PO box, unique) or a neighbourhood for each ZIP. USPS delivery-type products are licensed, and no clean-rights source maps ZIP codes to neighbourhoods — so the Simpson County codes above are listed without a column we would have to invent.
Cities and towns in Simpson County
Area codes covering Simpson County
Telephone and postal boundaries are drawn by different bodies, so these codes overlap the county without matching its edges.
Scope every ZIP code recorded in Simpson County. Source GeoNames US postal codes (2026-07 postal dump), Census 2024 county Gazetteer (2024 Gazetteer) and geoinfo-dataset (full_dataset) ZIP→NPA (2018 snapshot). Updated . The outline is a convex envelope of ZIP reference points, not a jurisdiction boundary.