Marriottsville, MD 21104 ZIP Code Profile

Related Place Profiles:
Henryton, MD

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ZIP Code 21104: Basic Data & USPS Preferred City Name

Preferred Name, USPS
Marriottsville, MD 21104

Acceptable Alternative
Henryton, MD 21104
Marriottsvl, MD 21104
Woodstock, MD 21104

  • ZIP Code Type: STANDARD
  • Businesses Addresses: 106
  • Single Family Addresses: 1,926
  • Multi-Family Addresses: 0
  • County: Carroll County
  • Centroid: Latitude 39.344, Longitude -76.907
  • Time Zone: Eastern Time Zone (UTC -5 hours)
  • Observes DST: Yes

ZIP Code 21104 has segments in 3 Counties / Independent Cities (Baltimore, Carroll, Howard).

Neighborhood Data

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21104 ZIP Code Map

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Marriottsville, MD 21104 Data & Demographics (As of July 1, 2016)


Total Population 5,161
Population in Households 5,097
Population in Familes 4,692
Population in Group Qrtrs 64
Population Density1 269
Diversity Index2 35


Total Households 1,638
Average Household Size 3.11
Family Households 1,376
Average Family Size 3


Total Housing Units 1,697 (100%)
Owner Occupied HU 1,513 (89.2%)
Renter Occupied HU 125 ( 7.4%)
Vacant Housing Units 59 ( 3.5%)
Median Home Value $525,606
Average Home Value $571,365


Median Household Income $116,627
Average Household Income $146,597
Per Capita Income $46,980
  (Compound Annual Growth Rates)


2010-2015 2015-2020
Population 2.1% 2.25%
Households 2.12% 2.17%
Families 2.02% 2.09%
Median Household Income   1.14%
Per Capita Income   1.61%
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.

Marriottsville, MD 21104 - Peer Comparisons by Rank and Percentile

The table below compares 21104 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 # 235 49th
Population Density1 # 261 43rd
Diversity Index2 # 250 46th
Median Household Income # 52 89th
Per Capita Income # 86 81st

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

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