| ZIP Codes: | 9 ZIP Codes (5 Standard, 3 PO Box, 1 Unique) [See All] |
| Area Codes: | 220 / 326 / 740 / 937 |
| Timezone: | Eastern (GMT -05:00) |
| Local Time: | 2:13:22 PM |
| Population: | 50,021 [See All] |
| FIPS: | 39159 |
| CBSA: | Columbus, OH |
| Land Area: | 362 sq mi |
| Water Area: | 4 sq mi |
| Coordinates: | 40.2640, -83.3926 |
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50,021 residents live across 9 ZIPs covering 362 sq mi, served by 8 distinct USPS-recognized cities.
Population moved from 41,993 to 49,958 from 2014 to 2024 — a +19.0% change. 5 ZIPs gained residents, 2 lost.
The county's wealthiest ZIP 43029 (Irwin, $107,744 median) and poorest ZIP 43036 (Magnetic Springs, $77,813) are 19.7 miles apart — a 1.4× income gap across local geography.
Median home values vary 2.3× across this county — from $137,500 in 43036 (Magnetic Springs) to $311,100 in 43040 (Marysville).
Density varies 129× across the county — from 24 people/sq mi in 43029 (Irwin) to 3,116 in 43036 (Magnetic Springs).
Educational attainment ranges from 14.7% bachelor's+ in 43344 (Richwood) to 33.5% in 43040 (Marysville) — the breadth of educational profiles across the area.
Within Ohio, this is the #49 most populous of 88 counties and ranks #6 for median household income with the #2 fastest decade growth .
Hosts 1 single-entity Unique ZIP: 43041O M Scott Co .
Weighted by population, the typical household earns about $96,877 across the county — reflecting what a typical resident sees, not a simple ZIP average.
30.3% of adults age 25+ hold a bachelor's degree or higher (10,625 of 35,060 reporting).
5 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 |
|---|---|---|---|---|---|---|
| 43040 | Marysville | Standard | 38,990 | $99,321 | 169.6 | 19.9% |
| 43344 | Richwood | Standard | 6,173 | $80,909 | 99.2 | 13.9% |
| 43067 | Raymond | Standard | 1,884 | $95,903 | 32.8 | 71.1% |
| 43045 | Milford Center | Standard | 1,739 | $99,181 | 38.1 | 0.8% |
| 43029 | Irwin | Standard | 544 | $107,744 | 22.5 | -13.8% |
| 43036 | Magnetic Springs | PO Box | 359 | $77,813 | 0.1 | 34.0% |
| 43077 | Unionville Center | PO Box | 269 | $104,545 | 0.1 | -21.1% |
| 43007 | Broadway | PO Box | 63 | — | 0.0 | — |
| 43041 | Marysville | Unique | — | — | 0.0 | — |