Franklin Kentucky ZIP Codes

Franklin holds 2 ZIP codes, all inside one county and one postal prefix.

We do not publish a delivery type (standard, PO box, unique) or a neighbourhood for each ZIP.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 Franklin codes above are listed without a column we would have to invent.

Scope every ZIP code recorded for Franklin. Source GeoNames US postal codes (2026-07 postal dump) and Census 2024 county Gazetteer (2024 Gazetteer). Updated 15 July 2026. ZIP codes are delivery-route groupings, not areas; the boundaries implied by any ZIP map are approximations.

Every Franklin ZIP code begins 421. Those first three digits identify the sectional center facility that processes mail for this part of Kentucky. Statewide that range covers 33 ZIP codes, so Franklin accounts for 6% of it.

Every Kentucky ZIP prefix and the region it covers →

ZIP codes and area codes are separate systems — one routes mail, the other routes calls — and they do not share boundaries. The codes below serve the same ground Franklin occupies.

• 270 Area code 270
• 364 Area code 364

Franklin Kentucky area codes in full →

Straight-line distance between place reference points, not driving distance.