US > Maryland > Carroll County > Marriottsville, MD 21104

21104 ZIP Code Profile, Map, Data & Demographics

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
  • 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).

  • Businesses Addresses: 116
  • PO Box Addresses: 0
  • Residential Addresses: 2,162
    • Multi-Family Addresses: 111
    • Single Family Addresses: 2,051

The ZIP Code maps and database are updated 4 times per year.
Database updated: June 1, 2025, Maps updated: May 1, 2024.

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Marriottsville, MD 21104 Data & Demographics (As of July 1, 2025)

POPULATION

Total Population 5,693 (100%)
Population in Households 5,685 (99.9%)
Population in Families 5,058 (88.8%)
Population in Group Quarters1 8 ( 0.1%)
Population Density 345
Diversity Index2 48
 
 

INCOME

Median Household Income $187,131
Average Household Income $237,749
% of Income for Mortgage4 24%
Per Capita Income $84,784
Wealth Index5 276
Socioeconomic Status Index6 High (66.2)
 

HOUSING

Total HU (Housing Units) 2,076 (100%)
Owner Occupied HU 1,914 (92.2%)
Renter Occupied HU 116 ( 5.6%)
Vacant Housing Units 46 ( 2.2%)
Median Home Value $721,154
Average Home Value $753,484
Housing Affordability Index3 97
 

HOUSEHOLDS

Total Households 2,030
Average Household Size 2.80
Family Households 1,647
Average Family Size 3.00
NOTES
  1. Group Quarters - a place where people live or stay in a group living arrangement. Includes college residents halls, nursing facilities, military barracks, and correctional facilities.
  2. The Diversity Index is a scale of 0 to 100 that represents the likelihood that two persons, chosen at random from the same area, belong to different races 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.
  3. The Housing Affordability Index base is 100 and represents a balance point where a resident with a median household income can normally qualify to purchase a median price home. Values above 100 indicate increased affordability, while values below 100 indicate decreased affordability.
  4. The % of Income for Mortgage quantifies the percentage of median household income dedicated to mortgage payments on a home priced at the median value (assuming a 30-year mortgage and a 20% down payment).
  5. The Wealth Index is based on a number of indicators of affluence including average household income and average net worth, but it also includes the value of material possessions and resources. It represents the wealth of the area relative to the national level. Values above or below 100 represent above-average wealth or below-average wealth compared to the national level.
  6. The Socioeconomic Index ranges from zero (lowest relative status) to 100 (highest relative status). This measure quantifies disparities in social position of an area's inhabitants and is built from a broad range of demographic, housing, and socioeconomic inputs. More information on this measure can be found in Esri's SEI tutorial.

GROWTH RATE / YEAR

 2020-2025 2025-2030
Population 0.14% 0.16%
Households 0.33% 0.23%
Families   0.24%
Median Household Income   2.75%
Per Capita Income   2.08%
Owner Occupied HU   0.19%

Marriottsville, MD 21104 - Peer Comparisons by Rank and Percentile

The table below compares 21104 to the other 458 ZIP Codes in Maryland by rank and percentile using July 1, 2025 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 # 228 50th
Population Density # 241 48th
Median Household Income # 27 94th
Housing Affordability Index # 340 74th
Per Capita Income # 18 96th
Diversity Index # 242 47th

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


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