County ZIP codes · Tennessee · FIPS 47093
Knox County, TN ZIP Codes
Knox County, Tennessee has 40 ZIP codes (Census 2020 ZCTA-county file; GeoNames postal codes, October 2026): 28 residential and 12 for PO boxes or a single organization. 23 of the residential ones lie mainly in Knox County and 5 mainly in a neighboring county; 10 cross the county line. Median household income ranges from $47,416 in 37912 to $132,807 in 37922 (Census Bureau, ACS 2020-2024).
- ACS2020-24
- Census2020
Where are the ZIP codes of Knox County?
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 $64,892 and $80,112.
They carry 10 postal town names.
Source: U.S. Census Bureau, ACS 2020-2024 5-year estimates (B19013).
All 28 residential ZIP codes in Knox County
23 ZIP codes lie mainly in Knox County; 5 more reach into it from a neighboring county and follow the first table.
| In this county | ||||||
|---|---|---|---|---|---|---|
| 37918 | Knoxville | 45,971 | 1,330 | $70k | $275k | 100% |
| 37920 | Knoxville | 44,995 | 622 | $66k | $268k | 99% |
| 37922 | Knoxville | 40,394 | 1,457 | $133k | $524k | 99% |
| 37931 | Knoxville | 31,842 | 1,123 | $92k | $360k | 91% |
| 37919 | Knoxville | 31,754 | 1,662 | $73k | $527k | 100% |
| 37923 | Knoxville | 30,131 | 2,717 | $74k | $333k | 100% |
| 37849 | Powell | 29,375 | 739 | $84k | $291k | 71% |
| 37921 | Knoxville | 28,717 | 1,806 | $60k | $226k | 100% |
| 37934 | Knoxville | 28,272 | 1,622 | $132k | $529k | 100% |
| 37932 | Knoxville | 25,424 | 877 | $120k | $463k | 100% |
| 37917 | Knoxville | 24,615 | 2,591 | $54k | $219k | 100% |
| 37912 | Knoxville | 21,505 | 2,037 | $47k | $211k | 100% |
| 37914 | Knoxville | 21,478 | 541 | $60k | $218k | 100% |
| 37938 | Knoxville | 17,437 | 539 | $84k | $323k | 99% |
| 37909 | Knoxville | 16,774 | 2,466 | $67k | $313k | 100% |
| 37916 | Knoxville | 15,583 | 11,060 | $15k | $270k | 100% |
| 37924 | Knoxville | 14,420 | 518 | $80k | $251k | 100% |
| 37721 | Corryton | 14,306 | 290 | $65k | $233k | 90% |
| 37871 | Strawberry Plains | 9,926 | 254 | $71k | $211k | 46% |
| 37915 | Knoxville | 5,991 | 3,161 | $26k | $211k | 100% |
| 37806 | Mascot | 3,674 | 202 | $60k | $221k | 89% |
| 37902 | Knoxville | 2,412 | 5,457 | $50k | $688k | 100% |
| 37929 | Knoxville | no residents | 0 | – | – | 100% |
Partly in Knox County
| In this county | ||||||
|---|---|---|---|---|---|---|
| 37754 | Heiskell | 4,211 | 110 | $76k | $196k | 27% |
| 37764 | Kodak | 12,562 | 369 | $71k | $284k | 13% |
| 37853 | Rockford | 3,365 | 201 | $69k | $222k | 9% |
| 37779 | Luttrell | 3,649 | 106 | $51k | $163k | 4% |
| 37709 | Blaine | 4,177 | 101 | $76k | $275k | 1% |
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?
13 ZIP codes of Knox County extend into another county. A ZIP code follows mail routes, not county borders.
| ZIP | In Knox | Elsewhere |
|---|---|---|
| 37920 | 99% | |
| 37922 | 99% | |
| 37931 | 91% | Anderson County 9% |
| 37849 | 71% | Anderson County 29% |
| 37938 | 99% | |
| 37721 | 90% | Union County 10% |
| 37764 | 13% | Sevier County 87% |
| 37871 | 46% | Jefferson County 42%; Sevier County 12% |
| 37754 | 27% | Anderson County 68%; Union County 4% |
| 37709 | 1% | Grainger County 99% |
| 37806 | 89% | Grainger County 11% |
| 37779 | 4% | Union County 96% |
| 37853 | 9% | Blount County 91% |
Source: U.S. Census Bureau, 2020 ZCTA-county relationship file (shares of land area).
PO Box and single-organization ZIP codes
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 3 prefixes: 377, 378 and 379.
| Prefix | Sectional center | Here | All codes |
|---|---|---|---|
| 377 | Knoxville, TN (SCF 377) | 5 | 53 |
| 378 | Knoxville, TN (SCF 377) | 4 | 67 |
| 379 | Knoxville, TN (SCF 377) | 31 | 31 |
Source: U.S. Postal Service, labeling list L005 (3-digit ZIP Code prefix groups, SCF sortation), effective October 1, 2026.