| Zip Code | City | Population ↓ |
|---|---|---|
| 37918 | Knoxville | 45,971 |
| 37920 | Knoxville | 44,995 |
| 37922 | Knoxville | 40,394 |
| 37931 | Knoxville | 31,842 |
| 37919 | Knoxville | 31,754 |
| 37923 | Knoxville | 30,131 |
| 37849 | Powell | 29,375 |
| 37921 | Knoxville | 28,717 |
| 37934 | Farragut | 28,272 |
| 37932 | Knoxville | 25,424 |
| 37917 | Knoxville | 24,615 |
| 37912 | Knoxville | 21,505 |
| 37914 | Knoxville | 21,478 |
| 37938 | Knoxville | 17,437 |
| 37909 | Knoxville | 16,774 |
| 37916 | Knoxville | 15,583 |
| 37924 | Knoxville | 14,420 |
| 37721 | Corryton | 14,306 |
| 37871 | Strawberry Plains | 9,926 |
| 37915 | Knoxville | 5,991 |
| 37806 | Mascot | 3,674 |
| 37902 | Knoxville | 2,412 |
| 37929 | Knoxville | 0 |
The data shown reflect ZCTAs from the US Census. As of 2025, there are 23 ZCTAs in Knox County, Tennessee (US Census).