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County ZIP codes · Kentucky · FIPS 21121

Knox County, KY ZIP Codes

Knox County, Kentucky has 19 ZIP codes (Census 2020 ZCTA-county file; GeoNames postal codes, October 2026): 18 residential and 1 for PO boxes or a single organization. 15 of the residential ones lie mainly in Knox County and 3 mainly in a neighboring county; 6 cross the county line. Median household income ranges from $23,157 in 40935 (Flat Lick) to $47,204 in 40701 (Corbin) (Census Bureau, ACS 2020-2024).

  • ACS2020-24
  • Census2020

Where are the ZIP codes of Knox County?

40701 · Corbin: $47k40734 · Gray: $43k40759 · Rockholds: $35k40763 · Siler: –40771 · Woodbine: –40903 · Artemus: $61k40906 · Barbourville: $23k40915 · Bimble: $42k40921 · Bryants Store: –40923 · Cannon: $48k40935 · Flat Lick: $23k40943 · Girdler: $67k40946 · Green Road: –40949 · Heidrick: $55k40953 · Hinkle: $16k40982 · Scalf: $16k40995 · Trosper: $36k40997 · Walker: –409064070140935407594073440997409034076340771409214098240953409954092340915409434094940701 · Corbin: $47k40734 · Gray: $43k40759 · Rockholds: $35k40763 · Siler: –40771 · Woodbine: –40903 · Artemus: $61k40906 · Barbourville: $23k40915 · Bimble: $42k40921 · Bryants Store: –40923 · Cannon: $48k40935 · Flat Lick: $23k40943 · Girdler: $67k40946 · Green Road: –40949 · Heidrick: $55k40953 · Hinkle: $16k40982 · Scalf: $16k40995 · Trosper: $36k40997 · Walker: –40906407014093540759407344090340763407714092140982409534092340701 · Corbin: $47k40734 · Gray: $43k40759 · Rockholds: $35k40763 · Siler: –40771 · Woodbine: –40903 · Artemus: $61k40906 · Barbourville: $23k40915 · Bimble: $42k40921 · Bryants Store: –40923 · Cannon: $48k40935 · Flat Lick: $23k40943 · Girdler: $67k40946 · Green Road: –40949 · Heidrick: $55k40953 · Hinkle: $16k40982 · Scalf: $16k40995 · Trosper: $36k40997 · Walker: –4090640701409354075940734409034076340771
The residential ZIP codes of Knox 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 18 postal town names.

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

All 18 residential ZIP codes in Knox County

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

Residential ZIP codes mainly in Knox County, largest first; "In this county" is the share of the ZIP's land in the county
In this county
40906 Barbourville 10,813 79 $23k $129k 98%
40734 Gray 3,602 79 $43k $132k 96%
40771 Woodbine 1,915 186 – $126k 87%
40935 Flat Lick 1,748 28 $23k $42k 100%
40943 Girdler 1,117 204 $67k – 100%
40923 Cannon 679 125 $48k $165k 100%
40915 Bimble 564 102 $42k <$10k 100%
40903 Artemus 558 31 $61k $39k 100%
40949 Heidrick 468 240 $55k $135k 100%
40953 Hinkle 454 46 $16k – 100%
40997 Walker 404 16 – $64k 100%
40982 Scalf 168 19 $16k $117k 100%
40921 Bryants Store 147 12 – – 100%
40995 Trosper 120 28 $36k – 100%
40946 Green Road 28 17 – – 100%

Partly in Knox County

Residential ZIP codes mainly in another county that reach at least 1% into Knox County, by their share here
In this county
40701 Corbin 30,526 203 $47k $161k 18%
40759 Rockholds 3,122 63 $35k $97k 15%
40763 Siler 411 16 – $81k 12%

Download the 19 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?

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

Share of each ZIP code's land in Knox County and in the neighboring counties
ZIPIn KnoxElsewhere
4070118%Whitley County 61%; Laurel County 20%
4090698%Whitley County 2%
4073496%Laurel County 4%
4075915%Whitley County 85%
4077187%Whitley County 13%
4076312%Whitley County 88%

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

PO Box and single-organization ZIP codes

ZIP codes in Knox County without a residential area (GeoNames postal codes)
ZIPPostal name
40930Dewitt

Source: GeoNames postal codes (CC BY 4.0).

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

The first three digits of a ZIP code name the sectional center, the mail processing plant that sorts it. Knox County's ZIP codes use 2 prefixes: 407 and 409.

Three-digit prefixes of Knox 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 Knox County's
PrefixSectional centerHereAll codes
407 Knoxville, TN (SCF 377) 5 19
409 Knoxville, TN (SCF 377) 14 35

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