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County ZIP codes · Kentucky · FIPS 21021

Boyle County, KY ZIP Codes

Boyle County, Kentucky has 7 ZIP codes (Census 2020 ZCTA-county file; GeoNames postal codes, October 2026): 5 residential and 2 for PO boxes or a single organization. 4 of the residential ones lie mainly in Boyle County and 1 mainly in a neighboring county; 4 cross the county line. Median household income ranges from $59,615 in 40422 (Danville) to $64,081 in 40468 (Perryville) (Census Bureau, ACS 2020-2024).

  • ACS2020-24
  • Census2020

Where are the ZIP codes of Boyle County?

40328 · Gravel Switch: $45k40422 · Danville: $60k40440 · Junction City: $55k40464 · Parksville: $67k40468 · Perryville: $64k404224032840468404644044040328 · Gravel Switch: $45k40422 · Danville: $60k40440 · Junction City: $55k40464 · Parksville: $67k40468 · Perryville: $64k404224032840468404644044040328 · Gravel Switch: $45k40422 · Danville: $60k40440 · Junction City: $55k40464 · Parksville: $67k40468 · Perryville: $64k4042240328404684046440440
The residential ZIP codes of Boyle 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?

They carry 5 postal town names: Danville, Junction City, Perryville, Gravel Switch, Parksville.

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

All 5 residential ZIP codes in Boyle County

4 ZIP codes lie mainly in Boyle County; 1 more reaches into it from a neighboring county and follows the first table.

Residential ZIP codes mainly in Boyle County, largest first; "In this county" is the share of the ZIP's land in the county
In this county
40422 Danville 25,950 240 $60k $220k 94%
40440 Junction City 2,428 184 $55k $135k 100%
40468 Perryville 2,084 70 $64k $172k 79%
40464 Parksville 936 32 $67k $153k 72%

Partly in Boyle County

Residential ZIP codes mainly in another county that reach at least 1% into Boyle County, by their share here
In this county
40328 Gravel Switch 963 16 $45k $96k 34%

Download the 7 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 Boyle County extend into another county. A ZIP code follows mail routes, not county borders.

Share of each ZIP code's land in Boyle County and in the neighboring counties
ZIPIn BoyleElsewhere
4042294%Lincoln County 6%
4046879%Washington County 14%; Mercer County 7%
4032834%Marion County 39%; Casey County 27%
4046472%Casey County 28%

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

PO Box and single-organization ZIP codes

ZIP codes in Boyle County without a residential area (GeoNames postal codes)
ZIPPostal name
40423Danville
40452Mitchellsburg

Source: GeoNames postal codes (CC BY 4.0).

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

The first three digits of a ZIP code name the sectional center, the mail processing plant that sorts it. Boyle County's ZIP codes use 2 prefixes: 403 and 404.

Three-digit prefixes of Boyle 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 Boyle County's
PrefixSectional centerHereAll codes
403 Lexington, KY (SCF 403) 1 47
404 Lexington, KY (SCF 403) 6 33

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