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County ZIP codes · Kentucky · FIPS 21049

Clark County, KY ZIP Codes

Clark County, Kentucky has 5 ZIP codes (Census 2020 ZCTA-county file; GeoNames postal codes, October 2026): 4 residential and 1 for PO boxes or a single organization. 1 of the residential ones lie mainly in Clark County and 3 mainly in a neighboring county; 3 cross the county line. Median household income ranges from $57,329 in 40353 (Mount Sterling) to $94,804 in 40509 (Lexington) (Census Bureau, ACS 2020-2024).

  • ACS2020-24
  • Census2020

Where are the ZIP codes of Clark County?

40353 · Mount Sterling: $57k40391 · Winchester: $64k40509 · Lexington: $95k40515 · Lexington: $86k4039140353405154050940353 · Mount Sterling: $57k40391 · Winchester: $64k40509 · Lexington: $95k40515 · Lexington: $86k4039140353405154050940353 · Mount Sterling: $57k40391 · Winchester: $64k40509 · Lexington: $95k40515 · Lexington: $86k40391403534051540509
The residential ZIP codes of Clark 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 $57,329 and $86,268.

They carry 3 postal town names: Lexington, Winchester, Mount Sterling.

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

All 4 residential ZIP codes in Clark County

1 ZIP code lies mainly in Clark County; 3 more reach into it from a neighboring county and follow the first table.

Residential ZIP codes mainly in Clark County, largest first; "In this county" is the share of the ZIP's land in the county
In this county
40391 Winchester 36,796 155 $64k $205k 99%

Partly in Clark County

Residential ZIP codes mainly in another county that reach at least 1% into Clark County, by their share here
In this county
40509 Lexington 47,036 984 $95k $366k 8%
40515 Lexington 37,384 675 $86k $341k 8%
40353 Mount Sterling 22,725 161 $57k $184k 6%

Download the 5 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?

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

Share of each ZIP code's land in Clark County and in the neighboring counties
ZIPIn ClarkElsewhere
405098%Fayette County 92%
405158%Fayette County 86%; Jessamine County 7%
4039199%
403536%Montgomery County 93%

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

PO Box and single-organization ZIP codes

ZIP codes in Clark County without a residential area (GeoNames postal codes)
ZIPPostal name
40392Winchester

Source: GeoNames postal codes (CC BY 4.0).

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

The first three digits of a ZIP code name the sectional center, the mail processing plant that sorts it. Clark County's ZIP codes use 2 prefixes: 403 and 405.

Three-digit prefixes of Clark 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 Clark County's
PrefixSectional centerHereAll codes
403 Lexington, KY (SCF 403) 3 47
405 Lexington, KY (SCF 403) 2 39

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