| ZIP Codes: | 14 ZIP Codes (12 Standard, 1 PO Box, 1 Unique) [See All] |
| Area Codes: | 326 / 937 |
| Timezone: | Eastern (GMT -05:00) |
| Local Time: | 2:13:21 PM |
| Population: | 111,367 [See All] |
| FIPS: | 39109 |
| CBSA: | Dayton-Kettering-Beavercreek, OH |
| Land Area: | 461 sq mi |
| Water Area: | 3 sq mi |
| Coordinates: | 40.0543, -84.2629 |
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111,367 residents live across 14 ZIPs covering 461 sq mi, served by 13 distinct USPS-recognized cities.
Population moved from 105,342 to 111,367 from 2014 to 2024 — a +5.7% change. 7 ZIPs gained residents, 6 lost.
The county's wealthiest ZIP 45337 (Laura, $108,162 median) and poorest ZIP 45317 (Conover, $61,429) are 22.9 miles apart — a 1.8× income gap across local geography.
Median home values vary 2.0× across this county — from $154,400 in 45326 (Fletcher) to $305,300 in 45317 (Conover).
Density varies 11× across the county — from 40 people/sq mi in 45312 (Casstown) to 442 in 45371 (Tipp City).
Educational attainment ranges from 9.7% bachelor's+ in 45326 (Fletcher) to 43.8% in 45339 (Ludlow Falls) — the breadth of educational profiles across the area.
Within Ohio, this is the #25 most populous of 88 counties and ranks #20 for median household income with the #12 fastest decade growth .
Hosts 1 single-entity Unique ZIP: 45374Hobart Corp .
Weighted by population, the typical household earns about $77,999 across the county — reflecting what a typical resident sees, not a simple ZIP average.
26.2% of adults age 25+ hold a bachelor's degree or higher (20,317 of 77,420 reporting).
12 Standard delivery, 1 PO Box only, 1 single-entity Unique ZIPs serve this county.
| ZIP | City | Type | Population | Median Income | Area (sq mi) | 10-yr Growth |
|---|---|---|---|---|---|---|
| 45373 | Troy | Standard | 37,565 | $75,742 | 88.7 | 6.3% |
| 45356 | Piqua | Standard | 25,237 | $69,188 | 76.3 | -1.0% |
| 45371 | Tipp City | Standard | 22,865 | $93,599 | 51.7 | 21.9% |
| 45383 | West Milton | Standard | 6,912 | $66,620 | 23.4 | -5.0% |
| 45318 | Covington | Standard | 5,511 | $73,867 | 45.7 | -3.8% |
| 45308 | Bradford | Standard | 4,385 | $70,435 | 52.1 | 5.3% |
| 45359 | Pleasant Hill | Standard | 2,160 | $77,083 | 14.8 | 14.7% |
| 45337 | Laura | Standard | 1,703 | $108,162 | 21.5 | 8.5% |
| 45326 | Fletcher | Standard | 1,446 | $93,472 | 23.3 | 53.2% |
| 45317 | Conover | Standard | 1,187 | $61,429 | 21.2 | 38.0% |
| 45312 | Casstown | Standard | 1,086 | $91,842 | 27.4 | -29.8% |
| 45339 | Ludlow Falls | Standard | 1,057 | $97,750 | 14.7 | -29.1% |
| 45361 | Potsdam | PO Box | 253 | $66,250 | 0.0 | -8.0% |
| 45374 | Troy | Unique | — | — | 0.0 | — |