County ZIP codes · Tennessee · FIPS 47123
Monroe County, TN ZIP Codes
Monroe County, Tennessee has 10 ZIP codes (Census 2020 ZCTA-county file; GeoNames postal codes, October 2026): 9 residential and 1 for PO boxes or a single organization. 4 of the residential ones lie mainly in Monroe County and 5 mainly in a neighboring county; 8 cross the county line. Median household income ranges from $53,605 in 37874 (Sweetwater) to $87,718 in 37774 (Loudon) (Census Bureau, ACS 2020-2024).
- ACS2020-24
- Census2020
Where are the ZIP codes of Monroe 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 $54,550 and $73,508.
They carry 9 postal town names.
Source: U.S. Census Bureau, ACS 2020-2024 5-year estimates (B19013).
All 9 residential ZIP codes in Monroe County
4 ZIP codes lie mainly in Monroe County; 5 more reach into it from a neighboring county and follow the first table.
| In this county | ||||||
|---|---|---|---|---|---|---|
| 37354 | Madisonville | 17,356 | 148 | $55k | $232k | 97% |
| 37874 | Sweetwater | 16,567 | 161 | $54k | $191k | 70% |
| 37385 | Tellico Plains | 9,015 | 34 | $61k | $217k | 100% |
| 37885 | Vonore | 6,271 | 43 | $79k | $335k | 98% |
Partly in Monroe County
| In this county | ||||||
|---|---|---|---|---|---|---|
| 37329 | Englewood | 6,591 | 111 | $71k | $173k | 16% |
| 37846 | Philadelphia | 4,579 | 63 | $72k | $202k | 15% |
| 37801 | Maryville | 28,090 | 405 | $74k | $320k | 12% |
| 37369 | Reliance | 713 | 7 | $59k | $115k | 10% |
| 37774 | Loudon | 21,784 | 247 | $88k | $365k | 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?
8 ZIP codes of Monroe County extend into another county. A ZIP code follows mail routes, not county borders.
| ZIP | In Monroe | Elsewhere |
|---|---|---|
| 37801 | 12% | Blount County 88% |
| 37774 | 1% | Loudon County 86%; Roane County 13% |
| 37354 | 97% | McMinn County 3% |
| 37874 | 70% | McMinn County 21%; Loudon County 9% |
| 37329 | 16% | McMinn County 85% |
| 37885 | 98% | Loudon County 2% |
| 37846 | 15% | Loudon County 43%; Roane County 39%; McMinn County 4% |
| 37369 | 10% | Polk County 90% |
Source: U.S. Census Bureau, 2020 ZCTA-county relationship file (shares of land area).
PO Box and single-organization ZIP codes
| ZIP | Postal name |
|---|---|
| 37314 | Cokercreek |
Source: GeoNames postal codes (CC BY 4.0).
Which first three digits do Monroe County's ZIP codes use?
The first three digits of a ZIP code name the sectional center, the mail processing plant that sorts it. Monroe County's ZIP codes use 3 prefixes: 373, 377 and 378.
| Prefix | Sectional center | Here | All codes |
|---|---|---|---|
| 373 | Chattanooga, TN (SCF 373) | 5 | 87 |
| 377 | Knoxville, TN (SCF 377) | 1 | 53 |
| 378 | Knoxville, TN (SCF 377) | 4 | 67 |
Source: U.S. Postal Service, labeling list L005 (3-digit ZIP Code prefix groups, SCF sortation), effective October 1, 2026.