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County ZIP codes · Kentucky · FIPS 21229

Washington County, KY ZIP Codes

Washington County, Kentucky has 7 ZIP codes (Census 2020 ZCTA-county file; GeoNames postal codes, October 2026), all residential. 4 of the residential ones lie mainly in Washington County and 3 mainly in a neighboring county; 4 cross the county line. Median household income ranges from $57,647 in 40033 (Lebanon) to $70,788 in 40069 (Springfield) (Census Bureau, ACS 2020-2024).

  • ACS2020-24
  • Census2020

Where are the ZIP codes of Washington County?

40033 · Lebanon: $58k40040 · Mackville: –40061 · Saint Catharine: –40069 · Springfield: $71k40078 · Willisburg: $54k40330 · Harrodsburg: $64k40468 · Perryville: $64k40330400694003340078404684004040033 · Lebanon: $58k40040 · Mackville: –40061 · Saint Catharine: –40069 · Springfield: $71k40078 · Willisburg: $54k40330 · Harrodsburg: $64k40468 · Perryville: $64k40330400694003340078404684004040033 · Lebanon: $58k40040 · Mackville: –40061 · Saint Catharine: –40069 · Springfield: $71k40078 · Willisburg: $54k40330 · Harrodsburg: $64k40468 · Perryville: $64k403304006940033400784046840040
The residential ZIP codes of Washington 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 $57,647 and $64,081.

They carry 7 postal town names: Harrodsburg, Lebanon, Springfield, Willisburg, Perryville, Mackville, Saint Catharine.

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

All 7 residential ZIP codes in Washington County

4 ZIP codes lie mainly in Washington County; 3 more reach into it from a neighboring county and follow the first table.

Residential ZIP codes mainly in Washington County, largest first; "In this county" is the share of the ZIP's land in the county
In this county
40069 Springfield 8,015 42 $71k $194k 98%
40078 Willisburg 2,661 43 $54k $183k 100%
40040 Mackville 779 43 – $159k 100%
40061 Saint Catharine 168 1,366 – – 100%

Partly in Washington County

Residential ZIP codes mainly in another county that reach at least 1% into Washington County, by their share here
In this county
40468 Perryville 2,084 70 $64k $172k 14%
40330 Harrodsburg 21,250 96 $64k $200k 12%
40033 Lebanon 11,923 85 $58k $174k 2%

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 Washington County extend into another county. A ZIP code follows mail routes, not county borders.

Share of each ZIP code's land in Washington County and in the neighboring counties
ZIPIn WashingtonElsewhere
4033012%Mercer County 88%
400332%Marion County 98%
4006998%Marion County 2%
4046814%Boyle County 79%; Mercer County 7%

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

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

The first three digits of a ZIP code name the sectional center, the mail processing plant that sorts it. Washington County's ZIP codes use 3 prefixes: 400, 403 and 404.

Three-digit prefixes of Washington 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 Washington County's
PrefixSectional centerHereAll codes
400 Louisville, KY (SCF 400) 5 54
403 Lexington, KY (SCF 403) 1 47
404 Lexington, KY (SCF 403) 1 33

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