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County ZIP codes · Kentucky · FIPS 21073

Franklin County, KY ZIP Codes

Franklin County, Kentucky has 13 ZIP codes (Census 2020 ZCTA-county file; GeoNames postal codes, October 2026): 5 residential and 8 for PO boxes or a single organization. 1 of the residential ones lie mainly in Franklin County and 4 mainly in a neighboring county; 5 cross the county line. Median household income ranges from $62,228 in 40379 (Stamping Ground) to $97,681 in 40003 (Bagdad) (Census Bureau, ACS 2020-2024).

  • ACS2020-24
  • Census2020

Where are the ZIP codes of Franklin County?

40003 · Bagdad: $98k40076 · Waddy: $92k40347 · Midway: $85k40379 · Stamping Ground: $62k40601 · Frankfort: $66k406014007640379403474000340003 · Bagdad: $98k40076 · Waddy: $92k40347 · Midway: $85k40379 · Stamping Ground: $62k40601 · Frankfort: $66k406014007640379403474000340003 · Bagdad: $98k40076 · Waddy: $92k40347 · Midway: $85k40379 · Stamping Ground: $62k40601 · Frankfort: $66k4060140076403794034740003
The residential ZIP codes of Franklin County (whole outlines, including the parts in neighboring counties), shaded by median household income in national fifths (ACS 2020-2024).<$54.1k$98.1k+no figure

Source: U.S. Census Bureau, 2020 ZCTA cartographic boundaries; ACS 2020-2024 5-year estimates (B19013).

How different are its ZIP codes?

The middle half of its ranked ZIP codes (1,000+ people living in households) report median household incomes between $62,228 and $91,786.

They carry 5 postal town names: Frankfort, Midway, Stamping Ground, Waddy, Bagdad.

Source: U.S. Census Bureau, ACS 2020-2024 5-year estimates (B19013).

All 5 residential ZIP codes in Franklin County

1 ZIP code lies mainly in Franklin County; 4 more reach into it from a neighboring county and follow the first table.

Residential ZIP codes mainly in Franklin County, largest first; "In this county" is the share of the ZIP's land in the county
In this county
40601 Frankfort 51,893 238 $66k $217k 89%

Partly in Franklin County

Residential ZIP codes mainly in another county that reach at least 1% into Franklin County, by their share here
In this county
40347 Midway 3,960 97 $85k $354k 12%
40003 Bagdad 1,807 42 $98k $345k 7%
40379 Stamping Ground 3,788 58 $62k $241k 7%
40076 Waddy 2,898 51 $92k $259k 4%

Download the 13 ZIP codes as CSV

Source: U.S. Census Bureau, ACS 2020-2024 5-year estimates; county shares by land area (Census 2020 ZCTA-county relationship file).

Which ZIP codes cross the county line?

5 ZIP codes of Franklin County extend into another county. A ZIP code follows mail routes, not county borders.

Share of each ZIP code's land in Franklin County and in the neighboring counties
ZIPIn FranklinElsewhere
4060189%Woodford County6%; Shelby County4%
4034712%Woodford County77%; Scott County11%
403797%Scott County90%; Owen County3%
400764%Shelby County87%; Anderson County9%
400037%Shelby County93%

Source: U.S. Census Bureau, 2020 ZCTA-county relationship file (shares of land area).

PO Box and single-organization ZIP codes

ZIP codes in Franklin County without a residential area (GeoNames postal codes)
ZIPPostal name
40602Frankfort
40603Frankfort
40604Frankfort
40618Frankfort
40619Frankfort
40620Frankfort
40621Frankfort
40622Frankfort

Source: GeoNames postal codes (CC BY 4.0).

Which first three digits do Franklin County's ZIP codes use?

The first three digits of a ZIP code name the sectional center, the mail processing plant that sorts it. Franklin County's ZIP codes use 3 prefixes: 400, 403 and 406.

Three-digit prefixes of Franklin County's ZIP codes, the sectional center for each (USPS labeling list L005, effective October 1, 2026) and how many of the prefix's codes are Franklin County's
PrefixSectional centerHereAll codes
400Louisville, KY (SCF 400)254
403Lexington, KY (SCF 403)247
406Lexington, KY (SCF 403)99

Source: U.S. Postal Service, labeling list L005 (3-digit ZIP Code prefix groups, SCF sortation), effective October 1, 2026.