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County ZIP codes · Kentucky · FIPS 21183

Ohio County, KY ZIP Codes

Ohio County, Kentucky has 17 ZIP codes (Census 2020 ZCTA-county file; GeoNames postal codes, October 2026), all residential. 12 of the residential ones lie mainly in Ohio County and 5 mainly in a neighboring county; 11 cross the county line. Median household income ranges from $53,750 in 42352 (Livermore) to $87,672 in 42366 (Philpot) (Census Bureau, ACS 2020-2024).

  • ACS2020-24
  • Census2020

Where are the ZIP codes of Ohio County?

40119 · Falls Of Rough: $66k42320 · Beaver Dam: $55k42328 · Centertown: $58k42333 · Cromwell: $34k42338 · Dundee: –42343 · Fordsville: $53k42347 · Hartford: $61k42349 · Horse Branch: $59k42352 · Livermore: $54k42354 · McHenry: $66k42361 · Olaton: $44k42366 · Philpot: $88k42368 · Reynolds Station: $76k42369 · Rockport: $63k42370 · Rosine: –42376 · Utica: $76k42378 · Whitesville: $73k42320423474237640119423664237842343423284234942368423614233342352423384236940119 · Falls Of Rough: $66k42320 · Beaver Dam: $55k42328 · Centertown: $58k42333 · Cromwell: $34k42338 · Dundee: –42343 · Fordsville: $53k42347 · Hartford: $61k42349 · Horse Branch: $59k42352 · Livermore: $54k42354 · McHenry: $66k42361 · Olaton: $44k42366 · Philpot: $88k42368 · Reynolds Station: $76k42369 · Rockport: $63k42370 · Rosine: –42376 · Utica: $76k42378 · Whitesville: $73k423204234742376401194236642378423434232842349423684236142333423524233840119 · Falls Of Rough: $66k42320 · Beaver Dam: $55k42328 · Centertown: $58k42333 · Cromwell: $34k42338 · Dundee: –42343 · Fordsville: $53k42347 · Hartford: $61k42349 · Horse Branch: $59k42352 · Livermore: $54k42354 · McHenry: $66k42361 · Olaton: $44k42366 · Philpot: $88k42368 · Reynolds Station: $76k42369 · Rockport: $63k42370 · Rosine: –42376 · Utica: $76k42378 · Whitesville: $73k423204234742376401194236642378423434232842349423684236142352
The residential ZIP codes of Ohio 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 $54,730 and $73,419.

They carry 17 postal town names.

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

All 17 residential ZIP codes in Ohio County

12 ZIP codes lie mainly in Ohio County; 5 more reach into it from a neighboring county and follow the first table.

Residential ZIP codes mainly in Ohio County, largest first; "In this county" is the share of the ZIP's land in the county
In this county
42320 Beaver Dam 9,128 61 $55k $150k 92%
42347 Hartford 5,829 48 $61k $135k 100%
42378 Whitesville 3,513 57 $73k $181k 63%
42349 Horse Branch 1,962 35 $59k $89k 90%
42343 Fordsville 1,267 16 $53k $87k 76%
42328 Centertown 1,158 18 $58k $97k 100%
42333 Cromwell 644 18 $34k $85k 95%
42361 Olaton 425 11 $44k $89k 69%
42354 McHenry 283 352 $66k $102k 100%
42369 Rockport 223 74 $63k $77k 100%
42370 Rosine 16 116 – – 100%
42338 Dundee 12 4 – – 100%

Partly in Ohio County

Residential ZIP codes mainly in another county that reach at least 1% into Ohio County, by their share here
In this county
42368 Reynolds Station 989 22 $76k $158k 44%
42352 Livermore 1,955 85 $54k $143k 41%
42376 Utica 6,886 70 $76k $208k 11%
40119 Falls Of Rough 1,976 18 $66k $129k 4%
42366 Philpot 5,851 67 $88k $230k 4%

Download the 17 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?

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

Share of each ZIP code's land in Ohio County and in the neighboring counties
ZIPIn OhioElsewhere
4232092%Butler County 8%
4237611%Daviess County 81%; McLean County 8%
423664%Daviess County 95%; Hancock County 1%
4237863%Daviess County 37%
401194%Breckinridge County 54%; Grayson County 42%
4234990%Grayson County 10%
4235241%McLean County 59%
4234376%Hancock County 21%; Breckinridge County 3%
4236844%Hancock County 56%
4233395%Butler County 5%
4236169%Grayson County 31%

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

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

The first three digits of a ZIP code name the sectional center, the mail processing plant that sorts it. Ohio County's ZIP codes use 2 prefixes: 401 and 423.

Three-digit prefixes of Ohio 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 Ohio County's
PrefixSectional centerHereAll codes
401 Louisville, KY (SCF 400) 1 36
423 Evansville, IN (SCF 476) 16 45

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