Zip Code 21661 — Rock Hall, MD
21661 is a ZIP Code associated with Rock Hall, MD, located within Kent. 21661 ranks #2 out of 9 ZIP codes in Kent County by population (and #289 out of 477 in MD). The area supports an estimated population of 2,613 residents across Data Pending housing units, with a population density of 30.5 people per square mile.
WorldPlaceData database updated: October 2026
📍 View location on OpenStreetMap (39.129050, -76.219670)
| Data Metric | Local Statistic |
|---|
| Postal / Zip Code | 21661 |
| Primary City | Rock Hall |
| State / Province | MD |
| County | Kent |
| Total Population | 2,613 |
| Median Household Income | Data Pending |
| Total Housing Units | Data Pending |
| Population Density | 30.5 people/sq mi |
| Timezone | America/New_York |
How 21661 Compares
| Metric | ZIP 21661 | Kent County | MD State Average |
|---|
| Population | 2,613 | 24,362 (Total) | 6,205,597 (Total) |
| Average ZIP Income | Data Pending | N/A | N/A |
| Population Density | 30.5 /sq mi | -- | -- |
| County Pop Rank | #2 of 9 | -- | -- |
Nearby ZIP Codes
Data Sources & Methodology: Geographic coordinates and ZIP Code assignments are derived from underlying geographic and postal datasets. Note that ZIP Codes are USPS postal delivery areas, while Census ZCTAs are statistical approximation areas. Read full methodology →