Miami County, OH ZIP codes
There are 12 ZIP codes in Miami County, OH, in 11 towns, from 45312 to 45383. The largest are 45373 (Troy), 45371 (Tipp City) and 45356 (Piqua).
The county seat is Troy.
- ZIP codes
- 12
- Towns
- 11
- County seat
- Troy
- County FIPS
39109- State
- Ohio
- Population
- 110,296
- Median household income
- $76,817
- Land area
- 407 sq mi
- Metro area
- Dayton-Kettering-Beavercreek
Miami County ZIP codes by town
Each ZIP code is listed under the county most of its land lies in and the town the Postal Service names it for; a ZIP code's own page shows exactly how it is split.
Map of Miami County ZIP codes
The ZIP codes of Miami County, shaded. Outlines are Census ZIP Code Tabulation Areas (2020), which approximate the mail routes; PO-box and single-address codes have no area and are not drawn. Click any area to open its ZIP code.
Miami County in numbers
About 110,296 people live in Miami County, in 44,906 households, the 25th most populous of Ohio's 88 counties. The median household income is $76,817 a year, 8% above the Ohio median of $71,389 (US: $80,734). The median owner-occupied home is valued at $229,100 (7% above the Ohio median), and median gross rent is $966 a month. The median age is 41.3; 26.8% of adults 25 and over hold a bachelor's degree or higher (31.5% across Ohio); the average commute takes 22 minutes.
| Population | 110,296 |
|---|---|
| Households | 44,906 |
| Median age | 41.3 |
| Median household income | $76,817 |
| Median home value | $229,100 |
| Median gross rent | $966 |
| Bachelor's degree or higher | 26.8% |
| Mean commute | 22.0 min |
| Population density | 271 / sq mi |
U.S. Census Bureau, American Community Survey 2020–2024 5-year estimates. Survey estimates carry margins of error, wider for small places. Sources and methods.
Largest towns in Miami County
| Town | ZIP codes | Population |
|---|---|---|
| Troy | 2 | 26,842 |
| Piqua | 1 | 20,646 |
| Tipp City | 1 | 10,439 |
| West Milton | 1 | 4,771 |
| Covington | 1 | 2,596 |
| Pleasant Hill | 1 | 1,526 |
| Fletcher | 1 | 719 |
| Laura | 1 | 436 |
| Casstown | 1 | 259 |
| Potsdam | 1 | 253 |
| Ludlow Falls | 1 | 105 |
Population of the census place of that name where there is one, otherwise of the ZIP codes the Postal Service addresses by it. A town's ZIP codes can reach past the county line.
Neighbouring counties
Counties that share a ZIP code with Miami County.
- Montgomery County (46)
- Greene County (17)
- Clark County (16)
- Darke County (16)
- Shelby County (12)
- Preble County (11)
- Champaign County (11)
Not sure you are in Miami County? What county am I in? answers from your location, near a county line included.
Every ZIP code in Miami County, with figures
| ZIP | City | Type | Population | Median income | Median home |
|---|---|---|---|---|---|
45312 | Casstown , OH | Standard | 1,086 | $91,842 | $279,400 |
45318 | Covington , OH | Standard | 5,511 | $73,867 | $199,400 |
45326 | Fletcher , OH | Standard | 1,446 | $93,472 | $154,400 |
45337 | Laura , OH | Standard | 1,703 | $108,162 | $228,700 |
45339 | Ludlow Falls , OH | Standard | 1,057 | $97,750 | $269,300 |
45356 | Piqua , OH | Standard | 25,237 | $69,188 | $156,400 |
45359 | Pleasant Hill , OH | Standard | 2,160 | $77,083 | $208,700 |
45361 | Potsdam , OH | Standard | 253 | $66,250 | $124,300 |
45371 | Tipp City , OH | Standard | 22,865 | $93,599 | $302,300 |
45373 | Troy , OH | Standard | 37,565 | $75,742 | $253,400 |
45374 | Troy , OH | No street area | — | — | — |
45383 | West Milton , OH | Standard | 6,912 | $66,620 | $171,800 |
Cite this page
zipcodes.pro. “Miami County ZIP codes.” Data release 2026-10-12. Retrieved 2026-10-20. https://zipcodes.pro/state/oh/county/miami
Underlying data is public domain or openly licensed — sources, vintages and licences.