Glen Arm, MD 21057 ZIP Code Profile

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Glen Arm, MD

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ZIP Code 21057: Basic Data & USPS Preferred City Name

Preferred Name, USPS
Glen Arm, MD 21057

  • ZIP Code Type: STANDARD
  • County: Baltimore County
  • Centroid: Latitude 39.449, Longitude -76.501
  • Time Zone: Eastern Time Zone (UTC -5 hours)
  • Observes DST: Yes
  • Businesses Addresses: 107
  • PO Box Addresses: 103
  • Residential Addresses: 1,615
    • Multi-Family Addresses: 199
    • Single Family Addresses: 1,416

The ZIP Code maps and database are updated 4 times per year.
Database updated: February 1, 2018, Maps updated: February 1, 2018.

EXTREMELY LOCAL Demographic Data

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21057 ZIP Code Map

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Glen Arm, MD 21057 Data & Demographics (As of July 1, 2017)


Total Population 4,291
Daytime Population: Workers 1,048
Daytime Population: Residents 2,186
Total Daytime Population (TDP) 3,234
Ratio TDP/Total Population1 0.75
Population in Households 4,260
Population in Familes 3,671
Population in Group Qrtrs 31
Population Density2 261
Diversity Index3 22


Median Household Income $97,318
Average Household Income $122,333
Per Capita Income $50,014


Total Housing Units 1,884 (100%)
Owner Occupied HU 1,502 (79.7%)
Renter Occupied HU 243 (12.9%)
Vacant Housing Units 139 ( 7.4%)
Median Home Value $455,082
Average Home Value $478,162


Total Households 1,745
Average Household Size 2.44
Family Households 1,273
Average Family Size 3
  1. If the ratio of the TDP to Total Population is greater than 1, the location gains population during the day when commuting workers are present. If the ratio is less than 1, the location is more of a bedroom community where people commute to another place for work.
  2. Population Density = Total Population per square mile.
  3. 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 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.


2010-2017 2017-2022
Population 1.07% 0.97%
Households 1.0% 0.92%
Families 0.89% 0.86%
Median Household Income   1.29%
Per Capita Income   1.87%

Glen Arm, MD 21057 - Peer Comparisons by Rank and Percentile

The table below compares 21057 to the other 456 ZIP Codes in Maryland by rank and percentile using July 1, 2017 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 # 251 45th
Population Density # 274 40th
Diversity Index # 362 21st
Median Household Income # 137 70th
Per Capita Income # 78 83rd

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

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