| ZIP Codes: | 21 ZIP Codes (15 Standard, 6 PO Box, 0 Unique) [See All] |
| Area Code: | 302 |
| Timezone: | Eastern (GMT -05:00) |
| Local Time: | 2:11:36 PM |
| Population: | 181,133 [See All] |
| FIPS: | 10001 |
| CBSA: | Dover, DE |
| Land Area: | 555 sq mi |
| Water Area: | 16 sq mi |
| Coordinates: | 39.1202, -75.5724 |
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181,133 residents live across 21 ZIPs covering 555 sq mi, served by 17 distinct USPS-recognized cities.
Population moved from 163,103 to 180,865 from 2014 to 2024 — a +10.9% change. 13 ZIPs gained residents, 3 lost.
The county's wealthiest ZIP 19962 (Magnolia, $104,260 median) and poorest ZIP 19954 (Houston, $60,345) are 12.0 miles apart — a 1.7× income gap across local geography.
Median home values vary 1.5× across this county — from $246,700 in 19953 (Hartly) to $381,000 in 19938 (Clayton).
Density varies 8× across the county — from 119 people/sq mi in 19952 (Harrington) to 937 in 19962 (Magnolia).
Educational attainment ranges from 5.3% bachelor's+ in 19964 (Marydel) to 42.5% in 19962 (Magnolia) — the breadth of educational profiles across the area.
Within Delaware, this is the #3 most populous of 4 counties and ranks #3 for median household income with the #3 fastest decade growth .
Weighted by population, the typical household earns about $76,597 across the county — reflecting what a typical resident sees, not a simple ZIP average.
27.5% of adults age 25+ hold a bachelor's degree or higher (33,559 of 122,059 reporting).
15 Standard delivery, 6 PO Box only, 0 single-entity Unique ZIPs serve this county.
| ZIP | City | Type | Population | Median Income | Area (sq mi) | 10-yr Growth |
|---|---|---|---|---|---|---|
| 19904 | Dover | Standard | 38,818 | $66,908 | 43.6 | 20.6% |
| 19901 | Dover | Standard | 37,763 | $66,388 | 85.2 | 1.7% |
| 19977 | Smyrna | Standard | 27,704 | $76,826 | 85.6 | 10.9% |
| 19934 | Camden Wyoming | Standard | 14,061 | $87,125 | 46.8 | 1.8% |
| 19962 | Magnolia | Standard | 13,770 | $104,260 | 14.7 | 30.0% |
| 19943 | Felton | Standard | 13,410 | $73,925 | 64.8 | 8.8% |
| 19952 | Harrington | Standard | 10,908 | $76,791 | 91.8 | 4.4% |
| 19938 | Clayton | Standard | 9,561 | $99,596 | 48.7 | 3.7% |
| 19946 | Frederica | Standard | 5,603 | $80,459 | 21.6 | 30.5% |
| 19953 | Hartly | Standard | 5,255 | $81,792 | 28.7 | 26.6% |
| 19954 | Houston | Standard | 1,427 | $60,345 | 7.5 | 4.5% |
| 19964 | Marydel | Standard | 1,418 | $99,402 | 8.6 | 4.6% |
| 19979 | Viola | Standard | 619 | $72,361 | 3.3 | -3.1% |
| 19955 | Kenton | PO Box | 352 | $44,634 | 0.1 | 262.9% |
| 19980 | Woodside | PO Box | 268 | $85,272 | 0.1 | — |
| 19936 | Cheswold | PO Box | 152 | $34,135 | 0.1 | -51.0% |
| 19902 | Dover Afb | Standard | 44 | — | 3.8 | -78.7% |
| 19905 | Dover | PO Box | — | — | 0.0 | — |
| 19906 | Dover | Standard | — | — | 0.0 | — |
| 19903 | Dover | PO Box | — | — | 0.0 | — |
| 19961 | Little Creek | PO Box | — | — | 0.0 | — |