County ZIP codes · Ohio · FIPS 39109
Miami County, OH ZIP Codes
Miami County, Ohio has 18 ZIP codes (Census 2020 ZCTA-county file; GeoNames postal codes, October 2026): 17 residential and 1 for PO boxes or a single organization. 11 of the residential ones lie mainly in Miami County and 6 mainly in a neighboring county; 10 cross the county line. Median household income ranges from $66,620 in 45383 (West Milton) to $108,162 in 45337 (Laura) (Census Bureau, ACS 2020-2024).
- ACS2020-24
- Census2020
Where are the ZIP codes of Miami 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 $73,867 and $80,605.
They carry 17 postal town names.
Source: U.S. Census Bureau, ACS 2020-2024 5-year estimates (B19013).
All 17 residential ZIP codes in Miami County
11 ZIP codes lie mainly in Miami County; 6 more reach into it from a neighboring county and follow the first table.
| In this county | ||||||
|---|---|---|---|---|---|---|
| 45373 | Troy | 37,565 | 428 | $76k | $253k | 100% |
| 45356 | Piqua | 25,237 | 334 | $69k | $156k | 85% |
| 45371 | Tipp City | 22,865 | 446 | $94k | $302k | 96% |
| 45383 | West Milton | 6,912 | 294 | $67k | $172k | 100% |
| 45318 | Covington | 5,511 | 118 | $74k | $199k | 99% |
| 45359 | Pleasant Hill | 2,160 | 157 | $77k | $209k | 100% |
| 45337 | Laura | 1,703 | 82 | $108k | $229k | 63% |
| 45326 | Fletcher | 1,446 | 62 | $94k | $154k | 100% |
| 45312 | Casstown | 1,086 | 40 | $92k | $279k | 98% |
| 45339 | Ludlow Falls | 1,057 | 76 | $98k | $269k | 100% |
| 45361 | Potsdam | 253 | 567 | $66k | $124k | 100% |
Partly in Miami County
| In this county | ||||||
|---|---|---|---|---|---|---|
| 45317 | Conover | 1,187 | 55 | $61k | $305k | 38% |
| 45308 | Bradford | 4,385 | 86 | $70k | $171k | 27% |
| 45322 | Englewood | 20,884 | 987 | $75k | $180k | 23% |
| 45344 | New Carlisle | 16,979 | 243 | $79k | $175k | 20% |
| 45424 | Dayton | 50,725 | 1,609 | $81k | $184k | 4% |
| 45309 | Brookville | 11,876 | 180 | $75k | $215k | 2% |
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?
11 ZIP codes of Miami County extend into another county. A ZIP code follows mail routes, not county borders.
| ZIP | In Miami | Elsewhere |
|---|---|---|
| 45424 | 4% | Montgomery County 85%; Greene County 11% |
| 45356 | 85% | Shelby County 15% |
| 45371 | 96% | Montgomery County 4% |
| 45322 | 23% | Montgomery County 77% |
| 45344 | 20% | Clark County 78%; Champaign County 1% |
| 45309 | 2% | Montgomery County 95%; Darke County 2% |
| 45318 | 99% | |
| 45308 | 27% | Darke County 73% |
| 45337 | 63% | Darke County 37% |
| 45317 | 38% | Champaign County 48%; Shelby County 14% |
| 45312 | 98% | Champaign County 2% |
Source: U.S. Census Bureau, 2020 ZCTA-county relationship file (shares of land area).
PO Box and single-organization ZIP codes
| ZIP | Postal name |
|---|---|
| 45374 | Troy |
Source: GeoNames postal codes (CC BY 4.0).
Which first three digits do Miami County's ZIP codes use?
The first three digits of a ZIP code name the sectional center, the mail processing plant that sorts it. Miami County's ZIP codes use 2 prefixes: 453 and 454.
Source: U.S. Postal Service, labeling list L005 (3-digit ZIP Code prefix groups, SCF sortation), effective October 1, 2026.