| ZIP Codes: | 23 ZIP Codes (22 Standard, 1 PO Box, 0 Unique) [See All] |
| Area Codes: | 302 / 410 / 443 / 667 |
| Timezone: | Eastern (GMT -05:00) |
| Local Time: | 11:52:54 PM |
| Population: | 26,834 [See All] |
| FIPS: | 24019 |
| CBSA: | Seaford, DE |
| Land Area: | 1,022 sq mi |
| Water Area: | 105 sq mi |
| Coordinates: | 38.6319, -75.5891 |
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267,041 residents live across 23 ZIPs covering 1,022 sq mi, served by 23 distinct USPS-recognized cities.
Population moved from 213,152 to 267,041 from 2014 to 2024 — a +25.3% change. 19 ZIPs gained residents, 3 lost.
The county's wealthiest ZIP 19930 (Bethany Beach, $125,491 median) and poorest ZIP 19933 (Bridgeville, $60,703) are 31.1 miles apart — a 2.1× income gap across local geography.
Median home values vary 3.8× across this county — from $235,300 in 19940 (Delmar) to $887,400 in 19930 (Bethany Beach).
Density varies 10× across the county — from 110 people/sq mi in 19950 (Greenwood) to 1,156 in 19967 (Millville).
Educational attainment ranges from 12.1% bachelor's+ in 19941 (Ellendale) to 72.3% in 19930 (Bethany Beach) — the breadth of educational profiles across the area.
Within Delaware, this is the #4 most populous of 4 counties and ranks #4 for median household income with the #2 fastest decade growth .
Weighted by population, the typical household earns about $80,132 across the county — reflecting what a typical resident sees, not a simple ZIP average.
32.5% of adults age 25+ hold a bachelor's degree or higher (65,698 of 201,855 reporting).
22 Standard delivery, 1 PO Box only, 0 single-entity Unique ZIPs serve this county.
1 ZIP in this county where more than 60% of adults 25+ hold a bachelor's degree — typically college campuses, research enclaves, or tech corridors.
Sussex County grew 15.4% over the past decade — concentrated in 5 high-growth ZIPs:
| ZIP | City | Type | Population | Median Income | Area (sq mi) | 10-yr Growth |
|---|---|---|---|---|---|---|
| 19966 | Millsboro | Standard | 35,884 | $78,305 | 97.1 | 34.7% |
| 19958 | Lewes | Standard | 31,938 | $97,197 | 49.1 | 46.2% |
| 19973 | Seaford | Standard | 26,834 | $64,387 | 80.0 | 15.4% |
| 19963 | Milford | Standard | 23,500 | $71,108 | 102.9 | 24.1% |
| 19947 | Georgetown | Standard | 20,760 | $71,229 | 117.0 | 12.5% |
| 19956 | Laurel | Standard | 16,327 | $65,603 | 101.3 | 5.6% |
| 19968 | Milton | Standard | 15,486 | $87,163 | 71.3 | 74.3% |
| 19971 | Rehoboth Beach | Standard | 14,886 | $102,146 | 18.1 | 25.5% |
| 19975 | Selbyville | Standard | 10,862 | $88,568 | 26.0 | 28.3% |
| 19933 | Bridgeville | Standard | 10,597 | $60,703 | 68.2 | 19.2% |
| 19945 | Frankford | Standard | 9,640 | $87,638 | 60.5 | 12.2% |
| 19970 | Ocean View | Standard | 8,524 | $94,103 | 10.0 | 27.4% |
| 19950 | Greenwood | Standard | 7,918 | $75,305 | 71.8 | 4.2% |
| 19940 | Delmar | Standard | 7,540 | $65,024 | 41.3 | 34.6% |
| 19939 | Dagsboro | Standard | 7,490 | $89,806 | 27.5 | 24.2% |
| 19960 | Lincoln | Standard | 6,774 | $67,200 | 30.0 | -8.1% |
| 19941 | Ellendale | Standard | 3,435 | $75,139 | 30.4 | -1.4% |
| 19930 | Bethany Beach | Standard | 3,014 | $125,491 | 6.1 | 42.4% |
| 19967 | Millville | Standard | 2,376 | $98,301 | 2.1 | 437.6% |
| 19951 | Harbeson | Standard | 2,245 | $95,546 | 9.1 | 33.8% |
| 19944 | Fenwick Island | Standard | 636 | $121,250 | 1.3 | -0.2% |
| 19931 | Bethel | Standard | 375 | $99,375 | 1.2 | 66.7% |
| 19969 | Nassau | PO Box | — | — | 0.0 | — |