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County ZIP codes · Kentucky · FIPS 21009

Barren County, KY ZIP Codes

Barren County, Kentucky has 14 ZIP codes (Census 2020 ZCTA-county file; GeoNames postal codes, October 2026): 12 residential and 2 for PO boxes or a single organization. 6 of the residential ones lie mainly in Barren County and 6 mainly in a neighboring county; 7 cross the county line. Median household income ranges from $42,893 in 42127 (Cave City) to $70,191 in 42171 (Smiths Grove) (Census Bureau, ACS 2020-2024).

  • ACS2020-24
  • Census2020

Where are the ZIP codes of Barren County?

42123 · Austin: $61k42127 · Cave City: $43k42130 · Eighty Eight: –42131 · Etoile: –42133 · Fountain Run: $62k42141 · Glasgow: $53k42154 · Knob Lick: $58k42156 · Lucas: $98k42160 · Park City: $49k42166 · Summer Shade: $50k42171 · Smiths Grove: $70k42749 · Horse Cave: $46k4214142749421714212742166421604213342154421234215642123 · Austin: $61k42127 · Cave City: $43k42130 · Eighty Eight: –42131 · Etoile: –42133 · Fountain Run: $62k42141 · Glasgow: $53k42154 · Knob Lick: $58k42156 · Lucas: $98k42160 · Park City: $49k42166 · Summer Shade: $50k42171 · Smiths Grove: $70k42749 · Horse Cave: $46k4214142749421714212742166421604213342154421234215642123 · Austin: $61k42127 · Cave City: $43k42130 · Eighty Eight: –42131 · Etoile: –42133 · Fountain Run: $62k42141 · Glasgow: $53k42154 · Knob Lick: $58k42156 · Lucas: $98k42160 · Park City: $49k42166 · Summer Shade: $50k42171 · Smiths Grove: $70k42749 · Horse Cave: $46k42141427494217142127421664216042133421544212342156
The residential ZIP codes of Barren 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 $45,500 and $52,896.

They carry 12 postal town names.

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

All 12 residential ZIP codes in Barren County

6 ZIP codes lie mainly in Barren County; 6 more reach into it from a neighboring county and follow the first table.

Residential ZIP codes mainly in Barren County, largest first; "In this county" is the share of the ZIP's land in the county
In this county
42141 Glasgow 31,506 117 $53k $185k 100%
42127 Cave City 7,030 78 $43k $164k 85%
42123 Austin 1,149 52 $61k – 100%
42156 Lucas 235 31 $98k $212k 100%
42130 Eighty Eight 124 40 – $222k 100%
42131 Etoile 72 15 – – 100%

Partly in Barren County

Residential ZIP codes mainly in another county that reach at least 1% into Barren County, by their share here
In this county
42160 Park City 2,822 44 $49k $157k 45%
42133 Fountain Run 1,456 19 $62k $164k 32%
42171 Smiths Grove 6,723 65 $70k $188k 25%
42166 Summer Shade 2,691 38 $50k $116k 24%
42154 Knob Lick 629 26 $58k $156k 13%
42749 Horse Cave 4,423 48 $46k $142k 6%

Download the 14 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?

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

Share of each ZIP code's land in Barren County and in the neighboring counties
ZIPIn BarrenElsewhere
4212785%Hart County15%
4217125%Warren County48%; Edmonson County28%
427496%Hart County80%; Metcalfe County13%
4216045%Edmonson County55%
4216624%Metcalfe County61%; Monroe County14%
4213332%Monroe County43%; Allen County24%
4215413%Metcalfe County87%

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

PO Box and single-organization ZIP codes

ZIP codes in Barren County without a residential area (GeoNames postal codes)
ZIPPostal name
42142Glasgow
42152Hiseville

Source: GeoNames postal codes (CC BY 4.0).

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

The first three digits of a ZIP code name the sectional center, the mail processing plant that sorts it. Barren County's ZIP codes use 2 prefixes: 421 and 427.

Three-digit prefixes of Barren 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 Barren County's
PrefixSectional centerHereAll codes
421Nashville, TN (SCF 370)1333
427Louisville, KY (SCF 400)138

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