| ZIP Codes: | 6 ZIP Codes (5 Standard, 1 PO Box, 0 Unique) [See All] |
| Area Codes: | 220 / 326 / 380 / 614 / 740 / 937 |
| Timezone: | Eastern (GMT -05:00) |
| Local Time: | 2:13:20 PM |
| Population: | 56,424 [See All] |
| FIPS: | 39097 |
| CBSA: | Columbus, OH |
| Land Area: | 558 sq mi |
| Water Area: | 3 sq mi |
| Coordinates: | 39.8548, -83.4046 |
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56,424 residents live across 6 ZIPs covering 558 sq mi, served by 6 distinct USPS-recognized cities.
Population moved from 51,181 to 56,424 from 2014 to 2024 — a +10.2% change. 5 ZIPs gained residents, 1 lost.
The county's wealthiest ZIP 43064 (Plain City, $139,591 median) and poorest ZIP 43162 (West Jefferson, $76,250) are 11.2 miles apart — a 1.8× income gap across local geography.
Median home values vary 2.5× across this county — from $184,000 in 43153 (South Solon) to $461,900 in 43064 (Plain City).
Density varies 8× across the county — from 21 people/sq mi in 43153 (South Solon) to 176 in 43064 (Plain City).
Educational attainment ranges from 17.7% bachelor's+ in 43143 (Mount Sterling) to 56.1% in 43064 (Plain City) — the breadth of educational profiles across the area.
Within Ohio, this is the #46 most populous of 88 counties and ranks #7 for median household income with the #5 fastest decade growth .
Weighted by population, the typical household earns about $102,492 across the county — reflecting what a typical resident sees, not a simple ZIP average.
31.5% of adults age 25+ hold a bachelor's degree or higher (12,571 of 39,873 reporting).
5 Standard delivery, 1 PO Box only, 0 single-entity Unique ZIPs serve this county.
| ZIP | City | Type | Population | Median Income | Area (sq mi) | 10-yr Growth |
|---|---|---|---|---|---|---|
| 43140 | London | Standard | 24,237 | $83,644 | 218.6 | 0.6% |
| 43064 | Plain City | Standard | 18,143 | $139,591 | 103.4 | 35.1% |
| 43162 | West Jefferson | Standard | 6,896 | $76,250 | 47.8 | 0.0% |
| 43143 | Mount Sterling | Standard | 5,803 | $100,333 | 136.0 | 3.3% |
| 43153 | South Solon | Standard | 1,112 | $90,417 | 51.8 | 21.1% |
| 43151 | Sedalia | PO Box | 233 | $62,292 | 0.2 | 2.6% |