| ZIP Codes: | 52 ZIP Codes (23 Standard, 12 PO Box, 17 Unique) [See All] |
| Area Code: | 302 |
| Timezone: | Eastern (GMT -05:00) |
| Local Time: | 2:11:36 PM |
| Population: | 573,431 [See All] |
| FIPS: | 10003 |
| CBSA: | Philadelphia-Camden-Wilmington, PA-NJ-DE-MD |
| Land Area: | 431 sq mi |
| Water Area: | 20 sq mi |
| Coordinates: | 39.7049, -75.6109 |
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573,431 residents live across 52 ZIPs covering 431 sq mi, served by 17 distinct USPS-recognized cities.
Population moved from 540,805 to 573,431 from 2014 to 2024 — a +6.0% change. 22 ZIPs gained residents, 6 lost (and 1 held flat).
The county's wealthiest ZIP 19707 (Hockessin, $172,696 median) and poorest ZIP 19801 (Wilmington, $52,810) are 8.0 miles apart — a 3.3× income gap across local geography.
Median home values vary 4.8× across this county — from $194,600 in 19802 (Wilmington) to $936,900 in 19807 (Wilmington).
Density varies 548× across the county — from 180 people/sq mi in 19734 (Townsend) to 98,467 in 19717 (Newark).
Educational attainment ranges from 23.3% bachelor's+ in 19720 (New Castle) to 78.5% in 19807 (Wilmington) — the breadth of educational profiles across the area.
Within Delaware, this is the #1 most populous of 4 counties and ranks #1 for median household income with the #4 fastest decade growth .
Hosts 4 single-entity Unique ZIPs: 19884Bank Of America ; 19893Chase Manhattan Bank N A ; 19898Wilmington ; and 19895Delmarva Power .
Weighted by population, the typical household earns about $95,647 across the county — reflecting what a typical resident sees, not a simple ZIP average.
39.9% of adults age 25+ hold a bachelor's degree or higher (159,354 of 399,404 reporting). The most-educated ZIPs cluster around Wilmington.
23 Standard delivery, 12 PO Box only, 17 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.
17 ZIP codes in this county serve a single facility — typically theme parks, universities, large corporations, airports, or government complexes.
Median household income spans 3.3× between the wealthiest and poorest ZIPs — a sign of significant intra-county inequality.
| ZIP | City | Type | Population | Median Income | Area (sq mi) | 10-yr Growth |
|---|---|---|---|---|---|---|
| 19720 | New Castle | Standard | 62,392 | $75,403 | 50.1 | 3.1% |
| 19702 | Newark | Standard | 55,683 | $92,446 | 28.2 | 6.0% |
| 19709 | Middletown | Standard | 53,234 | $132,956 | 82.1 | 40.7% |
| 19711 | Newark | Standard | 49,432 | $95,403 | 27.7 | -2.5% |
| 19701 | Bear | Standard | 42,984 | $111,198 | 27.7 | 5.4% |
| 19805 | Wilmington | Standard | 41,402 | $60,221 | 5.3 | 0.8% |
| 19808 | Wilmington | Standard | 39,082 | $94,234 | 13.8 | 2.0% |
| 19713 | Newark | Standard | 30,747 | $76,493 | 12.6 | 0.3% |
| 19810 | Wilmington | Standard | 26,530 | $112,775 | 7.9 | 3.5% |
| 19802 | Wilmington | Standard | 26,051 | $53,812 | 4.0 | 2.7% |
| 19803 | Wilmington | Standard | 22,279 | $135,218 | 12.6 | 4.9% |
| 19804 | Wilmington | Standard | 18,779 | $79,701 | 7.7 | 4.4% |
| 19707 | Hockessin | Standard | 17,376 | $172,696 | 12.8 | 9.3% |
| 19801 | Wilmington | Standard | 16,327 | $52,810 | 5.9 | 2.7% |
| 19703 | Claymont | Standard | 15,460 | $76,939 | 7.2 | 2.1% |
| 19809 | Wilmington | Standard | 14,311 | $81,288 | 10.7 | -1.1% |
| 19734 | Townsend | Standard | 14,214 | $127,803 | 79.1 | 22.6% |
| 19806 | Wilmington | Standard | 9,777 | $88,855 | 1.5 | 0.9% |
| 19807 | Wilmington | Standard | 7,815 | $153,341 | 18.9 | 9.9% |
| 19717 | Newark | Standard | 6,036 | — | 0.1 | 48.3% |
| 19706 | Delaware City | PO Box | 2,038 | $83,681 | 7.3 | 1.3% |
| 19731 | Port Penn | PO Box | 655 | $71,282 | 3.5 | 254.1% |
| 19730 | Odessa | PO Box | 425 | $112,083 | 0.6 | -40.9% |
| 19733 | Saint Georges | PO Box | 186 | $82,604 | 0.1 | -37.8% |
| 19736 | Yorklyn | Standard | 127 | — | 0.6 | — |
| 19732 | Rockland | PO Box | 89 | $236,000 | 1.5 | 21.9% |
| 19710 | Montchanin | PO Box | 0 | — | 0.5 | -100.0% |
| 19735 | Winterthur | Standard | 0 | — | 0.4 | — |
| 19716 | Newark | Standard | 0 | — | 0.9 | -100.0% |
| 19893 | Wilmington | Unique | — | — | 0.0 | — |
| 19898 | Wilmington | Unique | — | — | 0.0 | — |
| 19895 | Wilmington | Unique | — | — | 0.0 | — |
| 19892 | Wilmington | Unique | — | — | 0.0 | — |
| 19886 | Wilmington | Unique | — | — | 0.0 | — |
| 19891 | Wilmington | Unique | — | — | 0.0 | — |
| 19880 | Wilmington | PO Box | — | — | 0.0 | — |
| 19885 | Wilmington | Unique | — | — | 0.0 | — |
| 19884 | Wilmington | Unique | — | — | 0.0 | — |
| 19890 | Wilmington | Unique | — | — | 0.0 | — |
| 19708 | Kirkwood | PO Box | — | — | 0.0 | — |
| 19726 | New Castle | Unique | — | — | 0.0 | — |
| 19715 | Newark | PO Box | — | — | 0.0 | — |
| 19714 | Newark | PO Box | — | — | 0.0 | — |
| 19725 | Newark | Unique | — | — | 0.0 | — |
| 19712 | Newark | Unique | — | — | 0.0 | — |
| 19721 | New Castle | Unique | — | — | 0.0 | — |
| 19718 | Newark | Unique | — | — | 0.0 | — |
| 19896 | Wilmington | Unique | — | — | 0.0 | — |
| 19894 | Wilmington | Unique | — | — | 0.0 | — |
| 19897 | Wilmington | Unique | — | — | 0.0 | — |
| 19899 | Wilmington | PO Box | — | — | 0.0 | — |
| 19850 | Wilmington | PO Box | — | — | 0.0 | — |