| ZIP Codes: | 11 ZIP Codes (8 Standard, 3 PO Box, 0 Unique) [See All] |
| Area Codes: | 410 / 443 / 667 |
| Timezone: | Eastern (GMT -05:00) |
| Local Time: | 11:53:46 PM |
| Population: | 34,832 [See All] |
| FIPS: | 24011 |
| Land Area: | 359 sq mi |
| Water Area: | 7 sq mi |
| Coordinates: | 38.9347, -75.8447 |
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34,832 residents live across 11 ZIPs covering 359 sq mi, served by 11 distinct USPS-recognized cities.
Population moved from 33,809 to 34,832 from 2014 to 2024 — a +3.0% change. 4 ZIPs gained residents, 5 lost.
The county's wealthiest ZIP 21655 (Preston, $90,385 median) and poorest ZIP 21640 (Henderson, $53,558) are 22.3 miles apart — a 1.7× income gap across local geography.
Median home values vary 1.7× across this county — from $216,000 in 21632 (Federalsburg) to $359,300 in 21660 (Ridgely).
Density varies 3× across the county — from 44 people/sq mi in 21640 (Henderson) to 140 in 21639 (Greensboro).
Educational attainment ranges from 8.0% bachelor's+ in 21636 (Goldsboro) to 24.0% in 21655 (Preston) — the breadth of educational profiles across the area.
Within Maryland, this is the #20 most populous of 24 counties and ranks #21 for median household income .
Weighted by population, the typical household earns about $72,256 across the county — reflecting what a typical resident sees, not a simple ZIP average.
16.1% of adults age 25+ hold a bachelor's degree or higher (3,848 of 23,869 reporting).
8 Standard delivery, 3 PO Box only, 0 single-entity Unique ZIPs serve this county.
| ZIP | City | Type | Population | Median Income | Area (sq mi) | 10-yr Growth |
|---|---|---|---|---|---|---|
| 21629 | Denton | Standard | 10,252 | $73,956 | 86.5 | 6.5% |
| 21632 | Federalsburg | Standard | 6,436 | $61,316 | 80.6 | 10.2% |
| 21655 | Preston | Standard | 5,053 | $90,385 | 54.9 | -1.8% |
| 21639 | Greensboro | Standard | 4,682 | $62,772 | 33.6 | 5.8% |
| 21660 | Ridgely | Standard | 4,132 | $80,469 | 31.9 | -1.6% |
| 21649 | Marydel | Standard | 1,890 | $68,542 | 21.6 | -4.8% |
| 21640 | Henderson | Standard | 1,163 | $53,558 | 26.4 | -9.4% |
| 21636 | Goldsboro | Standard | 1,097 | $73,426 | 23.6 | -11.8% |
| 21641 | Hillsboro | PO Box | 127 | $66,875 | 0.1 | 101.6% |
| 21609 | Bethlehem | PO Box | — | — | 0.0 | — |
| 21670 | Templeville | PO Box | — | — | 0.0 | — |