First three digits · Tennessee
ZIP Codes Starting with
67 ZIP codes start with 378, sorted at the Knoxville, TN (SCF 377) sectional center (USPS labeling list L005, effective October 1, 2026) in Tennessee: 58 residential ZIP codes across 21 counties and 9 PO Box or single-organization codes (Census 2020 ZCTAs and GeoNames postal codes, October 2026).
What do the digits 378 mean?
The first digit, 3, is one of ten national areas (Alabama, Florida, Georgia, Mississippi, Tennessee and Armed Forces Americas). The first three, 378, route mail to a sectional center: USPS labeling list L005 (effective October 1, 2026) sends letters for 378 to the Knoxville, TN (SCF 377) facility. The last two digits pick the delivery area. By residents, the largest town names among the 378 ZIP codes are Maryville, Sevierville, Morristown, Oak Ridge, Powell and Seymour.
The same facility sorts 10 prefixes, 340 ZIP codes in all: 377, 378, 379, 407, 408, 409, 417, 418, 425, 426.
Where are the 378 ZIP codes?
Source: U.S. Census Bureau, 2020 ZCTA cartographic boundaries; ACS 2020-2024 5-year estimates (B19013).
All ZIP codes starting with 378
| County | ||||||
|---|---|---|---|---|---|---|
| 37801 | Maryville | Blount County | 28,090 | 405 | $74k | $320k |
| 37802 | Maryville | Blount County | PO Box or unique | – | – | – |
| 37803 | Maryville | Blount County | 33,822 | 385 | $83k | $356k |
| 37804 | Maryville | Blount County | 27,382 | 786 | $79k | $273k |
| 37806 | Mascot | Knox County | 3,674 | 202 | $60k | $221k |
| 37807 | Maynardville | Union County | 11,069 | 138 | $63k | $215k |
| 37809 | Midway | Greene County | 2,181 | 70 | $50k | $163k |
| 37810 | Mohawk | Greene County | 1,823 | 54 | $33k | $220k |
| 37811 | Mooresburg | Hawkins County | 3,931 | 102 | $52k | $163k |
| 37813 | Morristown | Hamblen County | 18,288 | 315 | $48k | $173k |
| 37814 | Morristown | Hamblen County | 35,239 | 803 | $56k | $221k |
| 37815 | Morristown | Hamblen County | PO Box or unique | – | – | – |
| 37816 | Morristown | Hamblen County | PO Box or unique | – | – | – |
| 37818 | Mosheim | Greene County | 5,774 | 125 | $50k | $169k |
| 37819 | Newcomb | Campbell County | 475 | 23 | – | $73k |
| 37820 | New Market | Jefferson County | 8,327 | 123 | $67k | $205k |
| 37821 | Newport | Cocke County | 22,909 | 177 | $44k | $142k |
| 37822 | Newport | Cocke County | PO Box or unique | – | – | – |
| 37824 | New Tazewell | Claiborne County | PO Box or unique | – | – | – |
| 37825 | New Tazewell | Claiborne County | 8,409 | 97 | $50k | $165k |
| 37826 | Niota | McMinn County | 3,449 | 64 | $63k | $214k |
| 37828 | Norris | Anderson County | 1,371 | 428 | $79k | $315k |
| 37829 | Oakdale | Morgan County | 1,977 | 45 | $91k | $157k |
| 37830 | Oak Ridge | Anderson County | 33,038 | 390 | $72k | $271k |
| 37831 | Oak Ridge | Anderson County | PO Box or unique | – | – | – |
| 37840 | Oliver Springs | Morgan County | 10,004 | 124 | $76k | $204k |
| 37841 | Oneida | Scott County | 10,199 | 69 | $51k | $159k |
| 37843 | Parrottsville | Cocke County | 4,426 | 84 | $58k | $180k |
| 37845 | Petros | Morgan County | 171 | 43 | $16k | – |
| 37846 | Philadelphia | Loudon County | 4,579 | 63 | $72k | $202k |
| 37847 | Pioneer | Campbell County | 2,513 | 17 | $35k | $116k |
| 37848 | Powder Springs | Grainger County | 145 | 18 | – | $168k |
| 37849 | Powell | Knox County | 29,375 | 739 | $84k | $291k |
| 37851 | Pruden | Claiborne County | no residents | 0 | – | – |
| 37852 | Robbins | Scott County | 2,733 | 26 | $37k | $118k |
| 37853 | Rockford | Blount County | 3,365 | 201 | $69k | $222k |
| 37854 | Rockwood | Roane County | 12,478 | 91 | $56k | $178k |
| 37857 | Rogersville | Hawkins County | 21,657 | 92 | $55k | $172k |
| 37860 | Russellville | Hamblen County | 3,700 | 154 | $74k | $202k |
| 37861 | Rutledge | Grainger County | 8,608 | 87 | $52k | $214k |
| 37862 | Sevierville | Sevier County | 21,767 | 266 | $60k | $322k |
| 37863 | Pigeon Forge | Sevier County | 6,617 | 384 | $53k | $284k |
| 37864 | Sevierville | Sevier County | PO Box or unique | – | – | – |
| 37865 | Seymour | Sevier County | 25,074 | 342 | $88k | $313k |
| 37866 | Sharps Chapel | Union County | 2,468 | 45 | $77k | $279k |
| 37867 | Shawanee | Claiborne County | PO Box or unique | – | – | – |
| 37868 | Pigeon Forge | Sevier County | PO Box or unique | – | – | – |
| 37869 | Sneedville | Hancock County | 5,271 | 40 | $39k | $160k |
| 37870 | Speedwell | Claiborne County | 4,385 | 53 | $56k | $126k |
| 37871 | Strawberry Plains | Knox County | 9,926 | 254 | $71k | $211k |
| 37872 | Sunbright | Morgan County | 2,346 | 26 | $59k | $145k |
| 37873 | Surgoinsville | Hawkins County | 3,960 | 63 | $44k | $179k |
| 37874 | Sweetwater | Monroe County | 16,567 | 161 | $54k | $191k |
| 37876 | Sevierville | Sevier County | 33,561 | 180 | $58k | $303k |
| 37877 | Talbott | Jefferson County | 9,185 | 347 | $78k | $235k |
| 37878 | Tallassee | Blount County | 761 | 29 | $55k | $270k |
| 37879 | Tazewell | Claiborne County | 11,854 | 68 | $48k | $154k |
| 37880 | Ten Mile | Meigs County | 3,599 | 49 | $65k | $216k |
| 37881 | Thorn Hill | Grainger County | 1,677 | 23 | $37k | $112k |
| 37882 | Townsend | Blount County | 2,914 | 16 | $69k | $345k |
| 37885 | Vonore | Monroe County | 6,271 | 43 | $79k | $335k |
| 37886 | Walland | Blount County | 3,670 | 87 | $82k | $262k |
| 37887 | Wartburg | Morgan County | 6,555 | 81 | $65k | $188k |
| 37888 | Washburn | Grainger County | 3,432 | 62 | $46k | $137k |
| 37890 | White Pine | Jefferson County | 6,821 | 198 | $59k | $234k |
| 37891 | Whitesburg | Hamblen County | 3,671 | 105 | $47k | $175k |
| 37892 | Winfield | Scott County | 1,631 | 23 | $43k | $110k |
Source: U.S. Census Bureau, ACS 2020-2024 5-year estimates; GeoNames postal codes (CC BY 4.0) for codes without a residential area.