| ZIP Codes: | 17 ZIP Codes (10 Standard, 7 PO Box, 0 Unique) [See All] |
| Area Codes: | 410 / 443 / 667 |
| Timezone: | Eastern (GMT -05:00) |
| Local Time: | 2:12:28 PM |
| Population: | 104,960 [See All] |
| FIPS: | 24015 |
| CBSA: | Philadelphia-Camden-Wilmington, PA-NJ-DE-MD |
| Land Area: | 375 sq mi |
| Water Area: | 30 sq mi |
| Coordinates: | 39.5638, -75.9495 |
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104,960 residents live across 17 ZIPs covering 375 sq mi, served by 16 distinct USPS-recognized cities.
Population moved from 101,767 to 104,960 from 2014 to 2024 — a +3.1% change. 9 ZIPs gained residents, 6 lost.
The county's wealthiest ZIP 21920 (Elk Mills, $124,146 median) and poorest ZIP 21914 (Charlestown, $66,806) are 10.2 miles apart — a 1.9× income gap across local geography.
Median home values vary 1.7× across this county — from $241,800 in 21913 (Cecilton) to $409,400 in 21917 (Colora).
Density varies 95× across the county — from 43 people/sq mi in 21912 (Warwick) to 4,142 in 21920 (Elk Mills).
Educational attainment ranges from 12.1% bachelor's+ in 21917 (Colora) to 36.3% in 21901 (North East) — the breadth of educational profiles across the area.
Within Maryland, this is the #13 most populous of 24 counties and ranks #14 for median household income .
Weighted by population, the typical household earns about $93,963 across the county — reflecting what a typical resident sees, not a simple ZIP average.
28.0% of adults age 25+ hold a bachelor's degree or higher (20,517 of 73,333 reporting).
10 Standard delivery, 7 PO Box only, 0 single-entity Unique ZIPs serve this county.
| ZIP | City | Type | Population | Median Income | Area (sq mi) | 10-yr Growth |
|---|---|---|---|---|---|---|
| 21921 | Elkton | Standard | 45,527 | $85,775 | 99.7 | 7.6% |
| 21901 | North East | Standard | 19,514 | $113,719 | 51.7 | 6.9% |
| 21911 | Rising Sun | Standard | 10,551 | $104,673 | 37.7 | -5.2% |
| 21904 | Port Deposit | Standard | 6,233 | $88,136 | 25.8 | -19.8% |
| 21903 | Perryville | Standard | 5,692 | $78,962 | 14.5 | -6.1% |
| 21918 | Conowingo | Standard | 4,169 | $84,587 | 20.1 | 3.7% |
| 21919 | Earleville | Standard | 3,626 | $106,500 | 50.3 | 4.2% |
| 21915 | Chesapeake City | Standard | 2,471 | $95,875 | 28.2 | -4.9% |
| 21917 | Colora | Standard | 2,233 | $96,750 | 7.8 | -25.2% |
| 21912 | Warwick | Standard | 1,536 | $69,868 | 35.4 | 9.2% |
| 21920 | Elk Mills | PO Box | 1,413 | $124,146 | 0.3 | 511.7% |
| 21913 | Cecilton | PO Box | 820 | $87,813 | 1.2 | 21.5% |
| 21914 | Charlestown | PO Box | 810 | $66,806 | 0.7 | 63.0% |
| 21902 | Perry Point | PO Box | 340 | — | 0.7 | 58.9% |
| 21930 | Georgetown | PO Box | 25 | — | 0.6 | -80.3% |
| 21916 | Childs | PO Box | — | — | 0.0 | — |
| 21922 | Elkton | PO Box | — | — | 0.0 | — |