| ZIP Codes: | 12 ZIP Codes (8 Standard, 3 PO Box, 1 Unique) [See All] |
| Area Codes: | 326 / 937 |
| Timezone: | Eastern (GMT -05:00) |
| Local Time: | 2:13:22 PM |
| Population: | 45,834 [See All] |
| FIPS: | 39149 |
| CBSA: | Sidney, OH |
| Land Area: | 374 sq mi |
| Water Area: | 2 sq mi |
| Coordinates: | 40.3430, -84.1934 |
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45,834 residents live across 12 ZIPs covering 374 sq mi, served by 11 distinct USPS-recognized cities.
Population moved from 46,680 to 45,834 from 2014 to 2024 — a -1.8% change. 6 ZIPs gained residents, 5 lost.
The county's wealthiest ZIP 45340 (Maplewood, $118,000 median) and poorest ZIP 45360 (Port Jefferson, $56,250) are 2.9 miles apart — a 2.1× income gap across local geography.
Median home values vary 3.2× across this county — from $99,800 in 45360 (Port Jefferson) to $316,900 in 45363 (Russia).
Density varies 62× across the county — from 34 people/sq mi in 45340 (Maplewood) to 2,114 in 45360 (Port Jefferson).
Educational attainment ranges from 8.2% bachelor's+ in 45360 (Port Jefferson) to 30.2% in 45845 (Fort Loramie) — the breadth of educational profiles across the area.
Within Ohio, this is the #54 most populous of 88 counties and ranks #13 for median household income .
Hosts 1 single-entity Unique ZIP: 45367Amos Press Inc .
Weighted by population, the typical household earns about $74,577 across the county — reflecting what a typical resident sees, not a simple ZIP average.
21.3% of adults age 25+ hold a bachelor's degree or higher (6,493 of 30,550 reporting).
8 Standard delivery, 3 PO Box only, 1 single-entity Unique ZIPs serve this county.
One ZIP holds the majority of this county's population — a sign of a county built around a single city or town.
| ZIP | City | Type | Population | Median Income | Area (sq mi) | 10-yr Growth |
|---|---|---|---|---|---|---|
| 45365 | Sidney | Standard | 28,965 | $67,051 | 160.0 | -3.9% |
| 45302 | Anna | Standard | 4,338 | $91,602 | 52.9 | 2.9% |
| 45845 | Fort Loramie | Standard | 3,429 | $95,078 | 32.1 | 11.8% |
| 45306 | Botkins | Standard | 2,124 | $86,354 | 30.7 | -15.1% |
| 45334 | Jackson Center | Standard | 1,882 | $70,595 | 27.3 | -17.7% |
| 45363 | Russia | Standard | 1,862 | $95,268 | 22.8 | 2.1% |
| 45333 | Houston | Standard | 1,830 | $63,906 | 22.9 | 53.0% |
| 45340 | Maplewood | Standard | 800 | $118,000 | 23.3 | 50.1% |
| 45360 | Port Jefferson | PO Box | 278 | $56,250 | 0.1 | -45.8% |
| 45353 | Pemberton | PO Box | 242 | $101,736 | 1.5 | 16.3% |
| 45336 | Kettlersville | PO Box | 84 | $87,500 | 0.0 | -54.3% |
| 45367 | Sidney | Unique | — | — | 0.0 | — |