Residential delivery area · Maryland
ZIP Code 21661: Rock Hall, MD
ZIP code 21661 uses the postal name Rock Hall, Maryland and lies entirely in Kent County (Census 2020 ZIP-county file). About 2,600 people live there (Census Bureau, ACS 2020-2024). Median household income is $90,492 (Census Bureau, ACS 2020-2024). By Census place, its land lies in Rock Hall (4%) and Edesville (under 1%); 95% is outside any Census place.
- ACS2020-24
- Census2020
- FHFA2025
- ZBP2023
- IRS2022
- Town
- Rock Hall · its only residential ZIP
- County
- Kent County
- Census places
- Rock Hall (4%); Edesville (under 1%) census-designated place
- House district
- MD-1 119th Congress
- State
- Maryland
- Time zone
- Eastern
- Land area
- 33.0 sq mi · 79 people per sq mi
Where is ZIP code 21661?
21661 centers on 39.096°, -76.219° and covers 33.0 square miles of land plus 22.0 of water. It borders 1 ZIP code: 21620.
The map draws ZIP code areas only. For the streets inside 21661, open its center on OpenStreetMap.
Source: U.S. Census Bureau, 2020 ZCTA cartographic boundaries and the 2023 Gazetteer (2020 ZCTAs); ZIP-to-county shares, Census places and House districts (119th Congress) from the Census 2020 relationship files (shares of land); metro area from the OMB delineation (July 2023); town name and time zone from simplemaps US ZIP Codes (CC BY 4.0).
How does 21661 compare with the rest of Kent County?
| Measure | 21661 | In Kent County | In MD |
|---|---|---|---|
| People (ACS 2020-2024) | 2,613 | 2nd of 9 | 289th of 477 |
| Median household income | $91k | 2nd of 5 | 193rd of 293 |
| Median home value | $283k | 5th of 5 | 271st of 320 |
Its median household income is higher than in 74% of U.S. residential ZIP codes, and it is denser than 50% of all U.S. residential ZIP codes. ZIP codes at the ACS caps ($250,000 or more for household income, $2,000,000 or more for home value) share the top rank.
Source: U.S. Census Bureau, ACS 2020-2024 5-year estimates (B01003, B19013, B25077); ranks by PlainZIP over residential ZIP codes (ZCTAs).
How many people live in 21661?
The 2020 Census counted 2,427 people in 21661; the ACS, which samples households over 2020-2024, estimates 2,613. Between the 2010 and 2020 censuses its population fell 8.5% (its boundary stayed at least 90% the same).
- People, ACS 2020-2024
- 2,613±296 (90% margin)
- 2020 Census count
- 2,427−8.5% since 2010 (2,653)
- Households
- 1,311
- Median age
- 58.4
Source: U.S. Census Bureau, ACS 2020-2024 5-year estimates (B01003, B01002, B11001); 2020 Census (DHC P1); 2010 Census (SF1 P1).
Who lives in 21661?
Of the 2,613 people the ACS estimates in 21661, 11.9% are under 18 and 33.1% are 65 or older. The largest group by race and Hispanic origin is White (not Hispanic) (87.8%).
- Under 1811.9%
- 18 to 6455.0%
- 65 and older33.1%
- White, not Hispanic87.8%
- Black, not Hispanic5.7%
- Hispanic or Latino4.9%
- Other or two or more1.5%
- Asian, not Hispanic0.0%
Source: U.S. Census Bureau, ACS 2020-2024 5-year estimates (B01001 age by sex, B03002 Hispanic or Latino origin by race); shares of the estimated population, small ZIP codes carry wide margins.
What do households in 21661 earn?
Median household income is $90,492 (ACS 2020-2024), the 2nd highest of the 5 ranked ZIP codes in Kent County. It rose from $50,613 in 2015-2019 (in 2024 dollars), a change larger than the surveys' margins of error.
- Median household income
- $90,492±$10,769
- Income per person
- $53,038
- Below the poverty line
- 11.8%
- Unemployed (of the labor force)
- 1.2%
- Adults 25+ with a bachelor's degree
- 35.7%
- Adjusted gross income per tax return, 2022
- $73,6381,200 returns; wages 51% of AGI (IRS)
Source: U.S. Census Bureau, ACS 2020-2024 and 2015-2019 5-year estimates (B19013, B19301, B17001, B23025, B15003; 2015-2019 dollars converted with the BLS CPI-U, 1.22699); IRS Statistics of Income, ZIP code data, tax year 2022 (adjusted gross income per return, filed under the address on the return).
What are homes worth in 21661?
FHFA's house price index for 21661, built from repeat sales and appraisals of the same homes, rose 100% from 2015 to 2025 and rose 57% from 2020 to 2025, and moved +4.2% in 2025.
- Median home value (owners' estimate)
- $283,200
- Median gross rent
- $1,000
- Homes owned by their occupants
- 74.8%
- Housing units
- 1,784
Source: U.S. Census Bureau, ACS 2020-2024 5-year estimates (B25077, B25064, B25003, B25001); FHFA House Price Index, annual five-digit ZIP, updated 2026-03-31.
What businesses are in 21661?
62 business establishments had a location in this ZIP code in 2023, 7 fewer than in 2018; the most are in retail trade (ZIP Code Business Patterns).
- Retail trade13
- Arts, entertainment, and recreation9
- Accommodation and food services9
- Other services (except public administration)7
- Health care and social assistance5
- Construction3
Source: U.S. Census Bureau, ZIP Code Business Patterns 2023 and 2018 (establishments with paid employees, by the business's ZIP code).
Which ZIP codes are next to 21661?
| ZIP | Town | People | Household income | Distance |
|---|---|---|---|---|
| 21620 | Chestertown | 13,810 | $81k | 10.7 mi |
| 21617 | Centreville | 10,428 | $117k | 9.9 mi (near) |
| 21638 | Grasonville | 5,420 | $140k | 10.8 mi (near) |
| 21619 | Chester | 6,152 | $108k | 10.9 mi (near) |
| 21658 | Queenstown | 3,632 | $128k | 11.2 mi (near) |
| 21056 | Gibson Island | 291 | $250k+ | 11.7 mi (near) |
| 21666 | Stevensville | 14,394 | $124k | 12.5 mi (near) |
| 21409 | Annapolis | 20,289 | $147k | 13.1 mi (near) |
Source: PlainZIP from the Census 2020 ZCTA boundaries (shared edges) and internal points; figures ACS 2020-2024.