Arnold, MD 21012 ZIP Code Profile

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Arnold, MD

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ZIP Code 21012: Basic Data & USPS Preferred City Name

Preferred Name, USPS
Arnold, MD 21012

  • ZIP Code Type: STANDARD
  • Businesses Addresses: 513
  • Single Family Addresses: 7,427
  • Multi-Family Addresses: 634
  • County: Anne Arundel County
  • Centroid: Latitude 39.047, Longitude -76.499
  • Time Zone: Eastern Time Zone (UTC -5 hours)
  • Observes DST: Yes

Neighborhood Data

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21012 ZIP Code Map

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Arnold, MD 21012 Data & Demographics (As of July 1, 2017)


Total Population 23,063
Daytime Population: Workers 8,108
Daytime Population: Residents 10,166
Total Daytime Population (TDP) 18,274
Ratio TDP/Total Population1 0.79
Population in Households 22,894
Population in Familes 19,714
Population in Group Qrtrs 169
Population Density2 2,369
Diversity Index3 33


Median Household Income $106,844
Average Household Income $130,711
Per Capita Income $47,223


Total Housing Units 8,638 (100%)
Owner Occupied HU 6,908 (80.0%)
Renter Occupied HU 1,377 (15.9%)
Vacant Housing Units 353 ( 4.1%)
Median Home Value $408,388
Average Home Value $490,782


Total Households 8,285
Average Household Size 2.76
Family Households 6,210
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.
  (Compound Annual Growth Rates)


2010-2015 2015-2020
Population 0.77% 0.85%
Households 0.61% 0.74%
Families 0.51% 0.67%
Median Household Income   1.17%
Per Capita Income   2.06%

Arnold, MD 21012 - Peer Comparisons by Rank and Percentile

The table below compares 21012 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 # 114 75th
Population Density # 100 78th
Diversity Index # 277 39th
Median Household Income # 89 81st
Per Capita Income # 91 80th

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

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