| ZIP Codes: | 10 ZIP Codes (10 Standard, 0 PO Box, 0 Unique) [See All] |
| Area Codes: | 220 / 326 / 380 / 614 / 740 / 937 |
| Timezone: | Eastern (GMT -05:00) |
| Local Time: | 2:13:19 PM |
| Population: | 227,622 [See All] |
| FIPS: | 39041 |
| CBSA: | Columbus, OH |
| Land Area: | 450 sq mi |
| Water Area: | 14 sq mi |
| Coordinates: | 40.2521, -83.0093 |
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227,622 residents live across 10 ZIPs covering 450 sq mi, served by 10 distinct USPS-recognized cities.
Population moved from 183,048 to 227,622 from 2014 to 2024 — a +24.4% change. 9 ZIPs gained residents, 1 lost.
The county's wealthiest ZIP 43021 (Galena, $167,941 median) and poorest ZIP 43003 (Ashley, $69,852) are 15.7 miles apart — a 2.4× income gap across local geography.
Median home values vary 2.4× across this county — from $230,800 in 43003 (Ashley) to $564,700 in 43021 (Galena).
Density varies 80× across the county — from 39 people/sq mi in 43066 (Radnor) to 3,126 in 43240 (Columbus).
Educational attainment ranges from 20.7% bachelor's+ in 43003 (Ashley) to 69.1% in 43035 (Lewis Center) — the breadth of educational profiles across the area.
Within Ohio, this is the #12 most populous of 88 counties and ranks #1 for median household income with the #1 fastest decade growth .
On the national stage, Delaware County is ranks #57 for income .
Weighted by population, the typical household earns about $134,622 across the county — reflecting what a typical resident sees, not a simple ZIP average.
58.7% of adults age 25+ hold a bachelor's degree or higher (89,798 of 152,886 reporting).
10 Standard delivery, 0 PO Box only, 0 single-entity Unique ZIPs serve this county.
4 ZIPs in this county where more than 60% of adults 25+ hold a bachelor's degree — typically college campuses, research enclaves, or tech corridors.
Delaware County grew 24.4% over the past decade — concentrated in 5 high-growth ZIPs:
| ZIP | City | Type | Population | Median Income | Area (sq mi) | 10-yr Growth |
|---|---|---|---|---|---|---|
| 43015 | Delaware | Standard | 61,401 | $105,322 | 131.1 | 20.8% |
| 43065 | Powell | Standard | 46,679 | $154,481 | 28.3 | 14.9% |
| 43035 | Lewis Center | Standard | 36,012 | $154,683 | 21.6 | 37.8% |
| 43082 | Westerville | Standard | 34,563 | $147,972 | 22.7 | 10.8% |
| 43074 | Sunbury | Standard | 16,873 | $119,296 | 86.2 | 41.7% |
| 43021 | Galena | Standard | 14,403 | $167,941 | 43.5 | 32.0% |
| 43240 | Columbus | Standard | 7,679 | $82,895 | 2.5 | 105.1% |
| 43061 | Ostrander | Standard | 4,921 | $157,568 | 45.3 | 24.6% |
| 43003 | Ashley | Standard | 3,723 | $69,852 | 33.8 | 57.4% |
| 43066 | Radnor | Standard | 1,368 | $129,012 | 35.2 | -2.2% |