Rock Hall, MD 21661 ZIP Code Profile

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Rock Hall, MD

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ZIP Code 21661: Basic Data & USPS Preferred City Name

Preferred Name, USPS
Rock Hall, MD 21661

  • ZIP Code Type: STANDARD
  • Businesses Addresses: 131
  • Single Family Addresses: 1,118
  • Multi-Family Addresses: 0
  • County: Kent County
  • Centroid: Latitude 39.138, Longitude -76.232
  • Time Zone: Eastern Time Zone (UTC -5 hours)
  • Observes DST: Yes

Neighborhood Data

Address Based Hyperlocal Data Input an address and get data & demographics for the pertinent census block group (CBG), a searchable map and a customized directory. The CBG is the smallest geographical unit used by the Census Bureau for reporting certain data.


21661 ZIP Code Map

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Rock Hall, MD 21661 Data & Demographics (As of July 1, 2016)


Total Population 2,675
Population in Households 2,655
Population in Familes 2,055
Population in Group Qrtrs 20
Population Density1 85
Diversity Index2 23


Total Households 1,220
Average Household Size 2.18
Family Households 764
Average Family Size 3


Total Housing Units 1,817 (100%)
Owner Occupied HU 916 (50.4%)
Renter Occupied HU 304 (16.7%)
Vacant Housing Units 597 (32.9%)
Median Home Value $295,882
Average Home Value $361,981


Median Household Income $46,265
Average Household Income $63,183
Per Capita Income $29,034
  (Compound Annual Growth Rates)


2010-2015 2015-2020
Population 0.28% 0.13%
Households 0.08% 0.02%
Families -0.04% -0.05%
Median Household Income   2.09%
Per Capita Income   1.62%
1) Population Density = Total Population per square mile.
2) The Diversity Index is a scale of 0 to 100 that represents the likelyhood that two persons, chosen at random from the same area, belong to different race or ethnic groups. If an area's entire population belongs to one race AND one ethnic group, then the area has zero diversity. An area's diversity index increases to 100 when the population is evenly divided into two or more race/ethnic groups.
Based on Census 2010 counts, the Diversity Index for the United States was 60.6 and it is expected to increase to 64.8 by July 1, 2018.

Rock Hall, MD 21661 - Peer Comparisons by Rank and Percentile

The table below compares 21661 to the other 455 ZIP Codes in Maryland by rank and percentile using July 1, 2016 data. The location Ranked # 1 has the highest value. A location that ranks higher than 75% of its peers would be in the 75th percentile of the peer group.

Variable Description Rank Percentile
Total Population # 289 37th
Population Density1 # 366 20th
Diversity Index2 # 346 25th
Median Household Income # 405 11th
Per Capita Income # 307 33rd

Additional comparisons and rankings can be made with a VERY EASY TO USE Maryland Census Data Comparison Tool.