| ZIP Codes: | 15 ZIP Codes (10 Standard, 5 PO Box, 0 Unique) [See All] |
| Area Codes: | 326 / 937 |
| Timezone: | Eastern (GMT -05:00) |
| Local Time: | 2:13:18 PM |
| Population: | 134,654 [See All] |
| FIPS: | 39023 |
| CBSA: | Springfield, OH |
| Land Area: | 391 sq mi |
| Water Area: | 5 sq mi |
| Coordinates: | 39.9281, -83.8287 |
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134,654 residents live across 15 ZIPs covering 391 sq mi, served by 10 distinct USPS-recognized cities.
Population moved from 136,568 to 134,654 from 2014 to 2024 — a -1.4% change. 5 ZIPs gained residents, 9 lost.
The county's wealthiest ZIP 45502 (Springfield, $88,988 median) and poorest ZIP 45506 (Springfield, $42,104) are 2.5 miles apart — a 2.1× income gap across local geography.
Median home values vary 2.6× across this county — from $95,500 in 45505 (Springfield) to $243,600 in 45502 (Springfield).
Density varies 38× across the county — from 49 people/sq mi in 45368 (South Charleston) to 1,880 in 45503 (Springfield).
Educational attainment ranges from 12.0% bachelor's+ in 45505 (Springfield) to 27.7% in 45502 (Springfield) — the breadth of educational profiles across the area.
Within Ohio, this is the #21 most populous of 88 counties and ranks #58 for median household income .
Weighted by population, the typical household earns about $64,738 across the county — reflecting what a typical resident sees, not a simple ZIP average.
20.3% of adults age 25+ hold a bachelor's degree or higher (18,884 of 93,196 reporting). The most-educated ZIPs cluster around Springfield.
10 Standard delivery, 5 PO Box only, 0 single-entity Unique ZIPs serve this county.
| ZIP | City | Type | Population | Median Income | Area (sq mi) | 10-yr Growth |
|---|---|---|---|---|---|---|
| 45503 | Springfield | Standard | 32,638 | $59,595 | 17.4 | -0.8% |
| 45505 | Springfield | Standard | 19,826 | $43,819 | 13.4 | 2.2% |
| 45502 | Springfield | Standard | 17,692 | $88,988 | 120.3 | 11.7% |
| 45344 | New Carlisle | Standard | 16,979 | $78,471 | 70.7 | 0.3% |
| 45504 | Springfield | Standard | 16,363 | $69,960 | 22.7 | -10.4% |
| 45506 | Springfield | Standard | 13,435 | $42,104 | 10.3 | -6.8% |
| 45323 | Enon | Standard | 4,961 | $80,781 | 6.2 | -8.8% |
| 45369 | South Vienna | Standard | 4,120 | $88,578 | 42.9 | 18.7% |
| 45368 | South Charleston | Standard | 3,889 | $60,850 | 79.2 | -16.8% |
| 45341 | Medway | Standard | 3,639 | $56,470 | 7.0 | 3.8% |
| 45319 | Donnelsville | PO Box | 308 | $67,708 | 0.3 | -21.2% |
| 43010 | Catawba | PO Box | 305 | $68,500 | 0.2 | -21.0% |
| 45372 | Tremont City | PO Box | 265 | $70,500 | 0.0 | -43.4% |
| 45349 | North Hampton | PO Box | 234 | $76,750 | 0.2 | -50.9% |
| 45501 | Springfield | PO Box | 0 | — | 0.0 | — |